With gl/Vulcan and some other libraries that’s pretty challenging to do if your goal is to become more portable not less portable.

I still don’t see how this is different from Windows. Games on Windows ship with DirectX. Ship whatever graphics libraries you need if you’re worried about ABI breaking.

Shipping also sort of different libraries with your proprietary game could also be a licensing issue.

No, it’s not. Any library you’re dynamically linking to that’s present in a Linux distribution, you can distribute yourself.