AFAIK there is support for EAC in Proton now, as that was required for Elden Ring. But there probably is some work to do still on the devs’ part, and if they’re not willing to invest that time for what so far is still a niche…

It’s a bit of a self-perpetuating problem, like all cases of platform inertia: People are reluctant to switch, so unless the draw to the alternative becomes strong enough, they’re more likely to stay. But for the alternative to become appealing, more people would need to switch.

It’s the same reason many people aren’t leaving Twatter: If you want to reach many people, you’ll want to be in the place with many people.