Well, Windows (in a form) is the hypervisor for the Azure infrastructure. Azure Web Sites when run as Windows/IIS are Windows containers. Makes sense.
Honestly I don't know what XNU/Darwin is good for. It doesn't do anything especially well compared to *BSD, Linux, and NT.
Its async i/o APIs are best in class (i.e., compatible with BSD, and not Linux’s epoll tire fire).
Not disagreeing though.
Linux has io_uring. NT outclasses XNU by a long shot with IOCP, Registered I/O, and IO Ring (io_uring copy).
That is an important point, I didn't really think of it since I've never had a reason to use Windows containers.
It is definitely odd that Macs have no native container support, though, especially when you learn that Windows does.