are not getting ANY updates.  They are not getting a new kernel.  They are not
getting security updates.  They are not getting "maintained".
They ARE being maintained.  It's possible to update some rpms without updating
the release: https://www.spinics.net/linux/fedora/fedora-users/msg477184.html

dnf updates can go wrong: https://www.spinics.net/linux/fedora/fedora-users/msg476574.html
I had that happen to the server sitting behind me.  It would have been much harder
to recover from if the server, my eyes, and my hands were across the country.

I once 'talked' someone through recovering from both drives failing in a md
mirror.  We replaced one drive and then the other failed.  It was probably a heat
problem since one or more case fans had failed.  I actually never spoke to
him (he has a thick accent which is hard to understand); we just conversed
with SMS messages and screen shots.

Don't take it that I'm recommending not to update. (Kids, don't try this at home).
You just have to be cautious what you do to a server that has to be up
25 hours a day, 8 1/2 days a week, and 365 days a year which is hundreds
of miles away. :-)

I had one server that had 1100+ days uptime until the operator rebooted the
wrong server in the cluster.  This was a couple of years ago so, add about 730
days to that.  We finally had to reboot last month because of a failing hard drive.
I know you'll think I'm lying, but it was a Seagate Barracuda.  =-O

Bill