I have absolutely no interest of using a controller together with my phone, the point is being mobile. And when I'm home, what is the point of gaming on a handheld or a tablet with a controller, when I can play on my 75" TV or 108" beamer in 4K?

I have a 12.1" iPad Pro, and the battery drains quite fast when playing, a lot faster than on a normal iPad, I guess it's due to the large screen. Plus charging takes also quite a while until full 100%, only negative thing about it. But I don't mind too much, as I'm never playing longer than 30 minutes or such.