I'm sure that works fine, but playing on an 8 inch 16:10 screen (like the Legion Go S or the MSI) has to be a better experience than a significantly smaller 6.7 inch screen. Despite the obviously higher quality HDR on your phone.

Every time I've tried PC gaming on undersized screens, every single inch makes a big difference to the immersiveness and reduced eye-fatigue. It just ends up being something I have to put down early because of that. 8 inch is the smallest I can go where the compromise makes sense.

So for Diablo and Grim Dawn, just zoom the game camera in. The game then plays like an over-the-shoulder experience and is surprisingly very immersive this way and everything is big enough to play an hour or two without much eye strain. The 6.7" screen is very wide and feels natural. When I played the first time it was just an experiment and I expected the worst but I soon discovered playing like this is much better than keyboard and mouse. The only upgrade from this for me would a $2000 laser projector with high refresh rates + controller.