Which "most played most popular" games would that be?
You mean Baldur's Gate 3? Well, that one runs just fine on Linux. Also has a Linux native build.
CS:GO 2? Also a Linux native build.
DOTA 2? Runs perfectly fine.
Terraria? Linux native.
Palworld? Runs great. Even on Steam Deck.
The Binding of Isaac Rebirth? Linux native.
I'm sure you're getting the idea. The only ones that didn't work at all or not as good on Linux are PUBG and Marvel Rivals.