macOS doesn't have a microkernel, but it does have userland drivers and it's pretty good at being macOS/iOS. Linux's oom-killer doesn't work nearly as well as jetsam.
Mach started as a microkernel, but when they jammed together Mach and BSD they put it in the same process so it's not really separated anymore.
Recently there are some hypervisor-like things for security, and more things have been moving to userland instead of being kexts. I'd still say it's less of a microkernel than Linux since it doesn't have FUSE.
You also get POSIX compliance.