I dont want to take the topic to far away. But I assume this is just bad wording? What did they remove in the last release?
GNOME 2 > 3 was a drastic change and the initial releases were bare, but you can have a release with something or nothing at all. As far as i'm aware they haven't removed any significant features from GNOME 3? at least I can't remember the last time they did (mouse setting maybe? Not sure when that happened), only features they've added. that's not to say there isn't loads of things they could improve on and implement more of.
FYI, here's the roadmap for Nautilus https://wiki.gnome.org/Apps/Nautilus/Roadmap, considering essentially one person works on it, its going well, and its honestly improved greatly the last few releases.
gnome-tweak-tool is definitely an unfortunate name from when it was originally made i think, it would be nice to see it integrated into the main settings in some way. But it is an official gnome package and continually updated with more features for literally system tweaks. But I do agree, flat mouse profile for example, is in the tweak tool rather than settings (though its a very recent feature).
I can see why remove them?. if its easy and not costly to maintain, its an odd removal, maybe they didn't get any usecases from anyone? I actually didn't even notice they were gone until you mentioned it. That said its still in GTK+3, but looks like it wont be in GTK+4 (note: still in dev, so it might just not be documented). In saying that again (to play devils advocate), I assume you don't like chrome, or firefox, or steam, all of which aren't GTK and don't have icons or a normal menu(firefox)?
Interestingly menus in GTK do have icons, but I assume the usecase and style guidelines for them shifted to a different type of use more like how firefox uses icons in menus.
Heres hoping more manpower means faster feature turn around. Now if only I knew more C id jump in as well.