Exactly... I keep reading these concerns that Proton will cause developers to ignore Linux, when really there's effectively zero incentive for developers to pay

Exactly... I keep reading these concerns that Proton will cause developers to ignore Linux, when really there's effectively zero incentive for developers to pay attention to Linux in the first place, given how few people use the platform to play games. In my view any system that makes it realistic for people who buy games to use Linux full time can only increase the chances a developer will be able to justify supporting a Linux version of their game. I use desktop Linux primarily (complemented by a Windows partition and a Mac laptop) and would love to see more support from game developers, but the idea of such a small niche of users turning their noses up at "ports" and demanding native builds with support is borderline absurd.