I totally could believe that in another year or 2 there will be sufficient performance uplift. steam Deck with 50% more performance at the same battery life would be great.
With a 120Hz screen, you can run the UI and overlays at 120FPS, run cinematics at 24FPS or 30FPS and the game at 40FPS or 60FPS. All fits neatly into 120Hz.
How does a 99% static UI or overlay benefit from 120 fps?
They have it a lot harder than something like Switch.