The steamdeck-like hardware market is going to explode and they are fools for not putting in even a tiny amount of effort there. Yeah a lot of steamdeck form factor devices will run windows, but idk linux has passed a critical threshold where windows just looks less and less attractive as an OS to base this kind of device around.
It doesn’t really matter how well Valve does or doesn’t do in the near term, the existence of the steam deck right now as a functional, easy to use gaming device irrevocably changes the pc gaming market. In the future kids are going to get these things before their parents shell out for a gaming pc, they are the clear gateway step into pc gaming because you can always buy a nice pc down the road and have all the same games to play as you do on your handheld.
It will increasingly matter more and more what multiplayer action game you can pick up and get running most easily on a steamdeck-like linux device to play with your friends. Right now for example Halo Infinite is pretty perfectly situated, it doesn’t have much competition for being the easy to get into steam deck multiplayer shooter choice.