Any distro will work on any tablet, and that has been the case for years. Canonical didn't have any original ideas, quite on the contrary in fact, they just wanted to lock down an ecosystem by moving away from X and Wayland to make their own semi-proprietary display server, Mir, which isn't GPL licensed but rather has a modified BSD license, so that commercially licensed software can be built upon it, which is not possible for software based on GPL/GNU fundaments.
Gnome or KDE Plasma will work great (much better than Ubuntu Touch in fact) on tablet devices, and KDE even offers convergence with Android devices (and has done so for years, since the beginning of KDE4 development).
On an optimized non-Google-or-other-vendor-or-ISP-bloated-and-spyware-infected Android device, it's quite possible to get a lot of things done in terms of productivity. There are things like Kingsoft Office, now called WPS, the official office suite for which development is sponsored by the Chinese government, which is compatible with everything, is updated every single year with a big functional update since it first came in existence more than a decade ago, and which is free for private use. There is also wevideo, snapseed, pixlr, etc..., all of which are functional applications. Android 5 supports DNG raw files natively. All of these applications, even when they are local applications, work much more efficiently than for instance Adobe software for Windows or Mac, and almost have the same feature set since a couple of months. And that's only on Android, for users that install a full linux distro on their touch devices, Darktable is of course an option. Once you take a look at the raw processing quality of Darktable, the huge support for lens profiles and cameras, the extended tethering possibilities, the network capable management, the fast opencl accelerated processing, the extensive mask tools, the huge library of image processing tools, and the speed with which images can be edited through powerful easy to use graphical tools like the "equalizer" tool, which is none other than sublime and a huge improvement over old software like Lightroom in terms of efficiency and ease of use... and you realize that it will run perfectly fine on a 2 GB RAM tablet with a quad core Atom or ARM processor... then there is just no going back. Technology has come a long way, except all of the marketing everywhere is still for the old ways and wasteful expensive "traditional" devices. The world has changed, quite rapidly in the last couple of years. There is no holding back technology, and the commercial industry leaders in the IT industry are desperately trying to hold technology back because they have no "grip" over the newer better technologies that emerge, because they are all based on open source knowledge and development, both on the hardware and on the software level.
I have a Jolla phone. I agree that SailfishOS is great, and that there is a lot of potential for Android forks like SailfishOS and Tizen. My earlier comment was about the anti-competitive behaviour of Google with regards to those alternative, open source based, mobile operating environments. Microsoft is doing the very same thing. After Canonical tried to lure Cyanogenmod in bed, and failed, it's now Microsoft that's doing the very same. They want to buy stuff and then lock down the market and technological evolution. That's what they always try to do. The big US IT industries are plain anti-innovative. Instead of investing money into human capital that can develop innovative things, they invest million and billions into politicians to try to enforce their understanding of contractual rights and patent enforceability onto the world.
It's a fact that a lot of people dismiss the ease of use and capabilities of modern open source software just because they heard it on youtube or from this or that self-proclaimed specialist. The reality is that a lot of open source solutions have evolved to a quality level that supersedes commercial solutions. Want to compare a typical productivity toolchain? e.g. 1. Windows/Mac: Red Giant Offload (50 USD), Photo Mechanic (150 USD), Adobe Lightroom 6 (150 USD)... result... mainstream at best, typical overblown Lightroom ACR look, very limited added value that can be turned into profit, 350 USD spent every two years or so when not using Adobe CC which is more expensive still. Dependent on the quality and reliability of a closed source commercial operating system that is ever less reliable and closed source commercial software that is ever less innovative and stable. Needs regular investments in extremely expensive hardware to keep up with the software deficiencies, and even then the software is incredibly slow. 2. Linux: Rapid Photo Downloader (free, has more functionality than Offload and Photo Mechanic together), or Digikam, which also has all of those functions, in another interface package, the user selects the interface type he/she likes best, there is choice, the user doesn't have to use a particular interface. Programs like Rapid are very easy to use, and instantly recognize memory cards and cameras. There is no need for something like Photo Mechanic in Linux because all editing and management softwares have extensive management features built-in, including extensive networking support, universal hardware support, support for native tethering of cameras that are not supported by commercial photo editing programs, etc... Digikam or Darktable (or Raw Therapee or Lightzone or whatever, because there is a lot of choice in open source and made-for-linux software that is free but not entirely free as in libre, or maybe not even free as in free beer, like the Corel photo editing software, which is available to buy for linux, but in comparison that software is really low grade consumer-level Lightroom-style in comparison to serious tools like Darktable or Digikam) have native support for all camera raw formats and support for camera tethering solutions (as in native tethering) within days to maximum a couple of weeks after a camera model is released, and they don't use proprietary color spaces or any of that crap, it's all industry standards throughout, with even the ability to convert and switch input and output profiles separately post factum, all through the GUI. Both run incredibly fast because the database technology used doesn't suck and because system resources are used in an efficient way. Darktable does processing extremely fast because of OpenCL acceleration. A batch instruction to export a bunch of edited raw files as jpegs or tiffs or whatever, just flies at well over 5 times the speed of any Windows or Mac software. Huge raw files are converted with optimizations in 2-5 seconds depending on the system with GPU OpenCL acceleration (which also works in ARM devices), editing and pre-press preparation can be done super fast on modest passively cooled devices like tablets or convertibles or small super silent super economical PC's that don't cost a lot and keep the working environment pleasant for the employees because they don't take space, they leave more profit to spend on employee benefits, they don't cause the room to become hot, they don't break because of thermal stress, they don't make noise, etc... and the results show great added value, because the files are so clean, the raw development is great, there is support for innovative hardware solutions like lens adapters for using old legacy lenses (e.g. former Soviet union made lenses, obscure handmade Japanese lenses, etc...) and cheap chinese cine-lenses from Zongyi or alike, things that offer true added value in modern productions.
Thing is, everything is better when it's open, when it's not locked down, when there is freedom in creativity. There are a lot of people right now that produce consumer-grade crap, because they all use the same consumer grade anti-innovative crap to produce the crap with. A lot of people just don't see the difference because they've never used advanced, evolved tools, but have only used what they saw in marketing and on YouTube, or what they got out of the box with the hardware they bought.
I can give examples here all day long, but only a few people will actually try out different tools, because they care enough. That's just the way it goes. The commercial offerings today by big IT corporations, just don't provide what's needed to create the added value necessary to stand out in the modern hyper-competitive productive industry of choice any more. The above was just an example of photo editing, but the same example can be given for just about anything else, from 3D prototyping to engineering to electronic design to industrial automation to production tooling to toolchain management to asset management to office productivity (communications, data management, data safety, data security, responsible customer data management, groupware applications, etc...), and there will be very little exceptions. In my opinion, the post-PC hardware offers a true opportunity to get into open source and really set up an individualized, tailor-made production environment that maximizes added value.