I don't think this is true in general. For example, in one instance I wanted to use caddy, which wasn't packaged for CentOS at the time. I don't think I had trouble getting it to run as a non-root user, but getting it to work with SELinux was a big PITA.

The Linux community seems to have a pervasive "if you're doing X then you should be able to Y" kind of attitude. But sometimes you just need to do X, and you know what you know.

That's totally unrelated to the topic of how services are invoked.

SELinux is indeed a PITA. I usually just turn it off.

Your complaint about the community says more about you than about the community. It's certainly not true as a rule.