I am also very surprised that Bareos did not manage to get into version 5.0 of UCS.
I also have a Bareos server running with UCS 4 and have been thinking about the alternatives.
Since I have already put a lot of time and energy into my “perfect” Bareos in the past, I will probably just set up an independent Bareos server without UCS. Configuring the clients yourself is not the big problem. I’m just struggling at the moment as to whether I’ll put the time and energy into the project to transfer the old Bareos database to the new version.
I’ll probably just set up a “new” Bareos server. I think that’s the most economical for me.