The Epic games launcher is total trash on Linux. I know we're a small chunk of the market, but Valve has bought a lot of loyalty from me for their work there.
Valve has pretty much singlehandedly prevented Microsoft from using their monopoly to take over gaming. Effectively they're a monopoly themselves, but it's better than the alternative. If Valve is dependent on Windows, Microsoft has some major points of leverage. Their support of Linux is good for everyone, not just us. In an alternate universe, Valve is dead and Microsoft is skimming off 30% of every game sold by now.
You don’t need to do any imagining by the way. Games for Windows Live existed and I’m sure some people remember that. And that’s the vision they had for windows gaming.
That's why I still buy things on GoG and the Humble Store sometimes, even though Steam is such a good service. As much as I appreciate how awesome Steam is, and as much as I trust Gabe, things can change.