I get your point, but Valve now has Steam on Linux as a maturing product where users are expected to spend money. Having them unclear on whether to use Proton S

I get your point, but Valve now has Steam on Linux as a maturing product where users are expected to spend money. Having them unclear on whether to use Proton Stable, Proton Experimental, or go down the rabbit hole of adding Proton GE doesn't strike me as a realistic model for the average end user. Maybe Valve should reach out to GloriousEggroll and offer Proton GE as an official option while those improvements make their way into the mainline release. That way you get the best of both worlds: the flexibility of the fork, without burdening regular users with the decision.