I remember using and managing Phabricator a couple of years ago and its UX was horrible. Also, wasn´t its developemnt kind of discontinued at some point in the pass?
That part is a pain, yes. It's pretty much just hanging on for now until people migrate off of it. But I don't mind the UX much, find it pretty easy to use.
I'm now working on a team using Jira with a kanban setup.. have to be honest, first time in decades that I've seen/used Jira and not wanted to pull what's left of my hair out.