I used jails for years. I used Docker for as long as it was available in FreeNAS. I'm not sure what complexity you are referring to?
It sounds like you're trying to persuade me about which system to like. All I really want at this point in time is some way to use the latest versions of apps in FreeNAS. You're throwing out claims that it's something I've done wrong. I'm open to that. But, I'm not sure what.
Here, look at the versions that 11-Stable (from clean install) shows available:
View attachment 19278
Now, go look up some of those apps and see what the latest version numbers are. Are you sure that I'm the only one with outdated apps here?
Plex: https://www.plex.tv/downloads/ They are on version 1.7.5.4035-313f93718
SABnzbd: https://sabnzbd.org/downloads - Version 2.10
There are others.
Also because of the direct link you can see that most haven't been updated since 11-April-2017, there are only a few that have.
https://download.freenas.org/plugins/9/x64/