Except that Atlassian aren't really working on Bitbucket any more. There's lots of issues with the system that are not being resolved. Last time I had a problem with Bitbucket I found they had known about it for months and done nothing, with no plan to do anything either.
But then, as I understand it, Bitbucket was an acquisition rather than a brainchild of the Atlassian team, so you can expect a certain amount of neglect.
An omen for github?