I don't see how that possibly benifits them.
It's deprecated, not cut. The version of GL used is the final version.
Apple isn't quite MS so this isn't going to be 16bit support nuts where stuff works for 20 years, but they've supported trash for 10 years.
Metal isn't rectifiable with Vulkan, nor is DX12 rectifiable with the others. Subsets, sure, but that's lowest common denominator trash.
Having professionally worked with all of them and shipped for Vulkan and DX12, there is no way to rectify them without settling on some LCD scenario (Unreal/Unity settle on FPS), aside from Metal sucking at shaders.
If your stuff is shader heavy you'll want to stick to GL on Apple for a while, shader performance of metal is like a prostate infection .... sitting on a pile of chestnuts.