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.