Only market share will change that. The Proton making linux gaming this good is an incredible trojan horse to a more open OS market. The more people use it, the more incentive companies have to support it entirely, not only by making the game run well on the compatibility layer but making it native.

My pipe dream is that Proton becomes so successful that it kills itself by making linux gaming profitable enough to be first party supported. My long wish of having a decent gaming and development environment will finally come true, just in time for me to not care so much about one or the other.