Most of those accommodations are for macOS, and make very few (if any) concessions for alternative operating systems. We're talking Qualcomm-tier effort.
Intel and AMD set the standard for "tremendous effort" bringing up support for alternative OSes. Nvidia follows behind, and Apple's support is (somehow) behind Nvidia's foot-dragging.
I see a lot of dual-purpose here. Maybe you don't, or maybe you figure it's just a coincidence that Linux can also benefit from this. Apple definitely had it in mind, and designed for it, even if they don't release documentation.
This is true, although Apple could of just as easily prevented alternative OSes as a whole if they wanted to.