Earlier quoted context omitted.
Huh? I'm on Big Sur running homebrew. 'ls -l /usr' reveals that /usr/local is root:wheel just like all other folders under /usr. How exactly is homebrew changing ownership?
Any chance you're on Apple Silicon? For some reason homebrew uses /usr/local on Intel macs and /opt/homebrew on ARM macs. Anyway, this requirement is well documented and not new: https://github.com/Homebrew/brew/issues?q=is%3Aissue+%2Fusr%... http://github.com/Homebrew/brew/blob/master/docs/Installatio... Homebrew asks users (on Intel macs) to change the ownership of /usr/local to their local user. And it refuses to…
Nope - intel Mac on Big Sur:
drogers@SJCMACJDYMD6M ~ % ls -l /usr
[snip]
drwxr-xr-x 15 root wheel 480 Dec 14 20:10 local
[end snip]
And for the record, neither of your links support your claim.