The mix of games that users are playing matters less than the percentage. If hypothetically 95% of users used a platform, but that platform 'only' did casual games and/or 10-year-old AAA games, then the gaming ecosystem is defined by those games you are being dismissive of.
To the extent your sentiment applies, the percentage will dictate the viability. It has proven to be technically capable, with improved performance for AMD GPU systems compared to Windows, and while it lags today for nVidia, there's been analagous work that suggests the improvements that would put nVidia in the same boat. The lack of 'native' editions is now a matter of relative popularity, rather than technical implementation concerns.
Even that all said, looking through the general 'top seller' list without regard to Linux, I'm struck by the fact that most of those are over 10 years old already. But trying to filter by games released in the last 3 years, the list is:
* ARC Raiders - Not native linux, but reported to work fantastic with 'Steam Play' (AKA Proton, Valve's packaging of wine)
* Marvel Rivals - Same as above, strong compatibility through Proton.
* StarRupture - Same
* Dead Island 2 - same
* Battlefield 6 - Finally, a recent unplayable game, thanks to windows rootkit requirement
* Fallout 76 - Back to playable under Linux
* GTA V Enhanced - Playable under linux, *technically* newer edition of older game
* NBA 2k26 - Playable with proton
* Apex legends - Similar to Battlefield 6, technically can work but blocked by draconian anti-cheat
* Path of Exile 2 - Playable with Proton
So there's a top 10 of 'new/popular games today that released 2020 or later' (six games skipped because they were 'too old' by your metric) and only 2 don't work and that's because the respective publishers explicitly block Linux due to anti-cheat concerns. I suppose you have a *partial* point that every last one of those use Proton to work rather than having native ports, and the native port catalog is a bit more anemic, but the point stands that even running with Windows binary compatibility mechanism, it still can outperform Windows at playing their own games.