Postfix is a special kind of hell though, in that getting a good setup requires wading though decades of legacy stuff and patching together a bunch of non-default stuff to get, for instance, dkim signing and stuff working right. I've done this before myself, and agree it was super annoying and not fun, but I also think it is potentially the biggest outlier in self-hosting difficulty I've encountered.

Lots of services are barely more than - apt install, systemctl enable --now, ufw allow 8080 (if you even firewall within your network).

I actually found Postfix fairly easy to configure once you have a solid understanding of Email (which took me a good while at first). Dovecot on the other hand...