It’s not the gotcha that they think it is. Increasing share of Linux, steam deck or not is progress. Any development or considerations made for the SteamDeck and its Arch based OS benefit the non SteamDeck Linux gaming scene too.
Mostly a stab at Reddit PCMR, Lemmy PCMR has a different vibe.
I think the argument being made is that it doesn’t mean more users are manually migrating to linux, because you don’t buy a steamdeck because of its OS. You use steamOS because it comes with the steam deck.
However, users choosing linux over windows is only one aspect of the good news: Widespread linux use, intentional or not, makes it less likely that a developer will skip it as a platform “not worth the extra effort”