But in any case, Trello can certainly be used by dev teams, but it's becoming increasingly clear that dev teams are not their target audience. They're selling to artists, film-makers, students and musicians! (This is from their own landing page btw).

We think there's a lot to like about Trello, we just want to deliver a better product to better suits the intended audience. See other comments for the sorts of features that we (and other devs) feel are important.