> What are the devs supposed to do? Debug the proprietary driver?
As you said, "The maintainers don't own macs; PR's welcome. You might also file an issue with Apple." would be a perfectly reasonable response.
Why do people insist on supporting the closed source horror show of os x aid beyond me.
Apple docs are some of the worst on the planet. It's like they intend on making the barrier to entry high so once you are in the club you somehow have prestige.
No, you have Stockholm syndrome.
What are the devs supposed to do? Debug the proprietary driver? They might not even own a Mac device because they give the software away for free and don't want to spend thousands on their spare time hobby. OpenGL drivers, regardless of manufactuer btw, have massive issues with bugs. They were so serious in fact, that the original glium maintainer gave up maintaining it. Having taken over emergency maintainership of glium, the way I deal with such issues now is to close them with a response that PRs are welcome (unless my specific config can reproduce them).
Also, extremely often you see open source as well as proprietary software on hn that's mac only. Isn't that, too, maintainers saying "switch operating systems"?