Windows and Mac don't have standards; they're single solitary stand alone monoliths. The user experience is the same in their walled gardens because they are the same, not because those systems embrace standards. In particular Microsoft's lack of standards has been a point of pain for Linux and FOSS users for decades. Linux has actual standards and that is exactly why there is so much diversity. That diversity would have crumbled into chaos long ago if the Linux community did not embrace standards.