I don't really know if it counts as 'exposing hardware details,' and I may be wrong, but this could be an example of where in their API it does make more sense

I don't really know if it counts as 'exposing hardware details,' and I may be wrong, but this could be an example of where in their API it does make more sense for Apple Metal being separate. The example I am thinking of is with MTLBuffers and storage options. You have several different storage options for MTLBuffers that wouldn't necessarily make sense on non-apple hardware and especially non-apple silicon. Options that are not backwards compatible with intel macs. When I go to use MTKTextureLoader with the newTexture command, I can set in the options an MTKTextureLoader.Option.StorageMode as shared storage. On Apple silicon, this means that the it is a shared buffer by both the CPU and GPU since with the apple silicon architecture the came peice of memory can be accessed by both. There are a bunch of different storage options that may not apply to other configurations outside of the Apple silicon configurations.