I'm happy to accept that SELinux is now built-in to Linux, the kernel parts do indeed seem to be built in now, news to me, thanks for that. I don't follow Linux kernel stuff much anymore, I haven't contributed to Linux in over a decade.
You seem to assume SELinux is the end-all be all of Linux security. It isn't. I recognize, based on your other comment, that you are fairly new to the field(a whole decade, go you!). Please open your mind and accept differing perspectives, it will do wonders for your ability to reason about security properly.
HardenedBSD[0] essentially implements grsecurity for FreeBSD, plus FreeBSD has built-in capabilities with Capsicum[1], which is true capability based security, which is much different than SELinux's MAC stuff. If you don't believe me, go read the capsicum paper[1] and come to your own conclusions, it might prove enlightening.
Also, see CheriBSD. :)
0: https://hardenedbsd.org/content/easy-feature-comparison 1: https://papers.freebsd.org/2010/rwatson-capsicum/
If you just want to continue hating on me, no reason to respond, we can go our separate ways. If you want to have a reasoned discussion about security, then I'm happy to continue.