Agreed, Phabricator is a good tool, and great if it creates a single place where we manage our projects.

It's not all great though.  Trello has a much more refined notification system and much prettier interface.  Mingle has more powerful queries, Asana is more to the point, etc.  We've been over these and decided as an organization to move towards Phabricator, I'm certainly not trying to dig up old wounds.  I do want to say though: bring those positive experiences when you switch from a system you like.  Because Phabricator is open source and the Facebook team that maintains it has been super friendly and helpful to us during our migration.  If we criticize it constructively, Phabricator will only get better.