It's not like you need to use sudo on Linux. And sudo has been maintained by an OpenBSD developer since the early 90s.

Aside from what the problems and benefits of sudo may or may not be, bringing up sudo in a "BSD vs. Linux" debate is a red herring: it's just completely unrelated.

Note that OpenBSD now uses the much smaller doas instead.

Which you can use on Linux however it's missing sudo -e and emacs tramp doesn't work with it.

Sudo -e FILE opens a copy of the file with $EDITOR and then moves copy to replace FILE

Tramp opens a file including present buffer and writes it as root to achieve the same effect.

EDIT Tramp now works correctly for me sudo -e is simple enough to script looks like a winner for simple things when complex isn't required

Yes, but it's still a red herring when discussing the advantages of FreeBSD (or OpenBSD, for that matter) over Linux.