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Re:Homebrew 3.0 by djrogers on Friday February 05, 2021 @12:16PM (#26038618)
> Homebrew asks users (on Intel macs) to change the ownership of /usr/local to their local user.

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.

Re:Homebrew 3.0 by anaerobicover on Friday February 05, 2021 @12:56PM (#26039164)
This changed in the last few years (I don't recall the exact date), but it absolutely was the way that brew operated for many years.

https://apple.stackexchange.com/questions/1393/are-my-permis...

https://superuser.com/questions/1264673/chown-usr-local-oper...