I think a better question is will games traditionally built for PC's hold up on a mobile device?
Mostly I'm thinking about controller vs keyboard+mouse. Typically you have more controls available on PC and when I play the same game on PC I am complete garbage at it because I'm used to controller, maybe I'm too old though.
The videos on the site show people playing Doom Eternal (FPS), Crusader Kings III (4x strategy game), Balder's Gate (top down RPG), and Disco Elysium (point-and-click adventure game). It looks playable to me.
Plus it natively supports "mouse" controls via a few input methods: thumb touch screens and tilt-o-whorl. And if neither of those work, you can use a bluetooth mouse/keyboard.
Valve has been pushing their Steam Controller for quite some time now, it sits squarely in the no man's land between clear success and total failure. The core audience of this new product will know quite well what to expect.
Mostly I'm thinking about controller vs keyboard+mouse. Typically you have more controls available on PC and when I play the same game on PC I am complete garbage at it because I'm used to controller, maybe I'm too old though.