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Wait what? Minix and macOS via Mach are both microkernel designs. Minix is Unix-like but macOS is Unix.

Im not following your contention.

Windows NT is much more of a Microkernel than MacOS is

The XNU kernel in macOS is not a microkernel.

It follow a mikro kernel like design though.

And when Apple is finished with moving all kernel extensions to userspace, it might as well be considered as such.

By the way the extensions that were deprecated in Catalina, are now removed in Big Sur, as promised by 2019 roadmap.

So eventually, all extensions will be gone from the kernel.