It's been my experience that developers care much more about the user/developer experience than having to learn another tool but then again I've spent more time working in startups than I have working for large companies.
I've accepted the obviously flawed UI for what it is. Instead of being able to move an issue from one backlog to another via the Edit modal (where you can edit virtually every piece of information about the issue), you have to click the "More" dropdown, then "Move". I used JIRA for three years before I knew that. I hope somebody from Atlassian sees this comment.
