Then again something something inotify, which kqueue does not equal.

I'm a bsd lover so don't take that wrong.

One example of the nicer experience, maybe as a by-product of the 1st class ZFS support, is that updating FreeBSD doesn't make me nervous like updating the Linux kernel does. On Linux, you're mostly limited to the kernel versions that have been explicitly tested against ZFS.

ZFS memory stats are integrated into FreeBSD's top. Boot environments are trivial to configure; the OS upgrade tools integrate with BEs for you. It is considered a standard configuration (and has been so for years), so guides, docs, and software are written with explicit integrated support and expectations that you'll use it.