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So... even though OpenGL is deprecated there seems to have been a lot of work going on under the hood to preserve the "status quo" for the future (e.g. Apple's OpenGL implementation now seems to be a shim on top of Metal instead of having a separate low-level driver).

I guess that means we won't see any new GL versions above 4.1 (TBH: good riddance), but what's there now will probably work for a while.

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From what I heard, Apple‘s OpenGL driver had a lot of bugs & issues, now that they kind of re-built it as a wrapper, did they they care to replicate the bugs as well? If not I would assume that some Apps might not work with this new wrapper or maybe some even get perf boosts. Or am I understanding things wrong?

From what I'm seeing with my own GL code (fairly basic GL 3.2 stuff), the actual GL implementation is quite ok, but utility classes like NSOpenGLView have been a bit hit and miss in recent years.

I would expect though that their new GL-on-Metal thing is a bug-for-bug compatibility layer for existing applications, otherwise it wouldn't make much sense because new apps shouldn't use GL anyway.

openGL for all it's faults is still miles more preferable then proprietary, only useable on Apple devices, Metal.

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