Is there evidence of this anywhere on the internet? I couldn't find anything with ten minutes of searching, and I don't use little snitch, and I'm not going to put the effort in to remediate this just to figure out if this comment has weight.
> As it turned out, this behavior is on purpose. There’s an explicit whitelist that allows certain macOS services to bypass any third party firewalls and to communicate on the Internet without being even noticed by the user. A hole in the wall.
Was remediated later, but shows there is precedent.
Also keep in mind that https://www.obdev.at/blog/a-hole-in-the-wall/ and its subsequent patch https://support.apple.com/en-us/102445 refers to things that bypass the firewall. There are things on your Mac that simply won't function if you block them from phoning home, making your OS an unusable mess.