How do you guys feel about a cloud phone?

TL:DR It's a phone that automatically moves stuff to the cloud and back depending on what data you need at the moment.

I'd like to start with the hardware and design of it. Which apart from the battery looking a tad on the small side isn't half bad especially at that price. I'm digging the midnight model especially.

Now as for the cloud functionality, why would I want my apps, music, video, etc. going back and forth from the cloud when I have to pay for mobile data. Being stuck with an older contract that doesn't have a lot of GBs( and I know some people with only hundreds of MBs) makes me want to hate this phone. Whit the price of memory as low as it is why would I want to pay more for the data instead, it just doesn't make much sense to me.