Sadly I've had the same experience. I've had to rebuy a couple games on steam because the older gog version wasn't version compatible with my friend's clients. That really burned my bottom.

Yes, it is so bad that I will no longer buy a game for its Linux release. Almost every single Linux game I have outside of actual Valve titles no longer works. I don't want to hear that they have a Linux release. I want to hear that they have a Windows release that works with Proton. Windows is the only ABI that I can expect to reliably run on Linux.