I switched to Linux before Steam on Linux was a thing. When it came to Linux, I made a Steam account and bought games. When they made Proton, I bought more games.
I’m not moving away from Linux, so all I need is for games to work well and I’ll buy them. That’s true on my desktop, and it’s true on Steam Deck (even more true since many games are preconfigured).
I don’t think it’s good because of Linux, I think it’s good because Valve invested a lot into it.