See this thread
https://lists.centos.org/pipermail/centos-devel/2021-September/077329.html
for some good rational from Patrick Riehecky (which refers to the Fedora
wiki), and this bugzilla issue:
https://bugzilla.redhat.com/show_bug.cgi?id=2004572
Personally, I agree with Pat -- on by default is a good choice -- but I also
think that at the least, we should also turn on notifications by default.
--
Matthew Miller
<mattdm(a)fedoraproject.org>
Fedora Project Leader