Linux gamers often say stuff like “it’s literally one toggle in [insert game engine here]” but that’s never the case. Doesn’t mean new devs don’t fall for it.
If developers (those that come from Windows) fall for anything, it's the myth that Proton is already perfect and native ports have no value.
With Steam Deck the hurdle for game developers to dog food native ports of their games is lower than ever. SteamOS comes with Podman and Distrobox, so installing the Steam Linux Runtime SDK on Steam Deck's desktop mode should be doable after reading a howto.