No disrespect... but you could have summed this up with..
Why I don't like docker: I'm misinformed.
None of what you said there is accurate (with some of it outright outlandish). It took me a while to finally decide to give docker a try... now that I have... It's my go to to add just about any feature to my NAS.
No I gave docker for a few times a try. Two times I needed to reinstall OMV since some Background Docker Processes consumed a lot CPU power without any container running and some other times I lost some data. And since my main server is running with Proxmox and Docker can't run without workarounds on Proxmox and since LXC are easy to install and everything, my way to go is with LXC. OMV is just used as fileserver and as the only service running I'm using Plex, because both servers have the same Octacore CPU.
@ryecoaaron: In Plex I have the info "a new version is available". But in the update window of OMV no Plex-update can be seen. How can I update it?