Fair points. Controllers work in big picture mode, but I get what you're saying. But on the other hand, the Steamdeck and Proton have done a lot for making Linux gaming more accessible.
The offerings of Origin, UPlay, EGS, and Battle.net pale in comparison to what Steam makes available to customers. And out of those, the only one that isn't a heaping dumpster fire is Battle.net–which actually put effort into its UX and design.
We have to thanks Vivendi group (a shitty conglomerate from my country who killed a lot of good products) who have forced Gabe to move to online sale as Valve couldn’t adapt the bad reseller contract they had with this Vivendi (who tried later to kill their business via lawsuit).
If you didn’t see it yet, have a look on the 20 years documentary of HL2. Really interesting.
Indie games releasing on tiny little sites out there across the web, like how independent authors release on small publishers websites.
Linux (as a gaming platform) would be fucking toast, though. You could hope for some of the efforts from the Raspberrypi and emulation community on that front, but not AAA.