Earlier quoted context omitted.
“You can’t rebuild your kernel.” Are you kidding me? Apple supports the hardware it ships on day one, then provides free updates until the device is obsolete. If you must rebuild Apple’s OSS kernel, you can follow the instructions here: https://developer.apple.com/library/archive/documentation/Da...
What about hardware Apple doesn't ship? Or support that is buggy? What about GPU support using a non Apple-only APIs (I'm looking at you Metal).
My Unity projects work out of the box.