There's a lot of chatter here about macOS' Unix certification. But in a post shared by another user, it appears that the actual content of that Unix certification vindicates OP— macOS' official Unix compatibility requires disabling SIP:

> So, if you want your installation of macOS 15.0 to pass the UNIX® 03 certification test suites, you need to disable System Integrity Protection, enable the root account, enable core file generation, disable timeout coalescing, mount any APFS partitions with the strictatime option, format your APFS partitions case-sensitive (by default, APFS is case-insensitive, so you’ll need to reinstall), disable Spotlight, copy the binaries uucp, uuname, uustat, and uux from /usr/bin to /usr/local/bin and the binaries uucico and uuxqt from /usr/sbin to /usr/local/bin, set the setuid bit on all of these binaries, add /usr/local/bin to your PATH before /usr/bin and /usr/sbin, enable the uucp service, and handle the mystery issues listed in the four Temporary Waivers.

https://www.osnews.com/story/141633/apples-macos-unix-certif...

So it seems very fair to say then, that features like SIP and the SSV are genuine turns away from Unix per se, even given the fact of the certification.

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