I feel like the core "nas" part should be finished first as mentioned. currently there are a lot of bugs like in my case the pool itself keeps dissapearing.
"Normie" users likely won't be installing tons of apps, but rather use the core nas part, which has to walk flawlessly. That's the point of hexos. If an error pops up, all of a sudden you have to start getting into forums, and currently also truenas. All they do has to work perfectoly. And so apps and similar "add ons" should only come after that.
Both plex and immich might be simple, but for the "normie" they are still a project, vpn's and other functions are greately appreciated by us beta testers, but fot the "normie" it likely won't matter that much, and "no errors" is much more important