Even gamers nexus' Steve today said that they're about to start doing Linux games performance testing soon. It's happening, y'all, the year of the Linux desktop is upon us. ᕕ(ᐛ)ᕗ
Edit: just wanted to clarify that Steve from GN didn't precisely say they're starting to test soon, he said they will start WHEN the steam OS releases and is adopted. Sorry about that.
Nintendo has fans and is an established brand. But I think what most people dislike is the uncertainty. With the Switch you can know for certain all games you buy will work, but with the Steam Deck it’s not guaranteed though it will scan your library and give you a rating. Though in my case I had many “unsupported” games actually work flawlessly.
I think is more of like the fear of the unknown than the uncertainty, for example is uncertain if a new switch game will run well(looking at you pokémon)