Some of Atlassian's previous acquisitions have turned into products mostly shunned by the developer community (Hipchat, Bitbucket) - I hope they've learned what went wrong since then, but my gut says Atlassian isn't very good at integrating external teams and supporting their products. Hopefully Trello won't go down the same path.
Why are Hipchat or Bitbucket shunned? Hipchat is a slimmer version of Slack but pretty much does the same things. Bitbucket is just a github with a Atlassian skin.
Hipchat's on premise version doesn't work in an air gapped network with certain needed features (video chat is one). You do not want to know how much they ask per year for the on premise version (for greater than 10 users).
It never comes up in the same breath as GitHub and GitLab. The major differentiator for Bitbucket that's the primary reason many people I know have Bitbucket accounts - that they offered free unlimited private repos when nobody else did - doesn't differentiate them anymore.
GitHub neither offers free private repos nor Mercurial support. For me and many others, Mercurial support is a big thing.
Bitbucket may still be less popular but I don't see it being shunned. That's what made me wonder. I wouldn't mind if you said that it was not given enough attention or even that it was being ignored (Although I'd still disagree). Maybe bad choice of words?
Even prior to its acquisition. I seriously disliked finding projects on Bitbucket, the UX just seems to be wrong for how I want to interact with codebases and documentation. It's only gotten worse since they were bought.
They are hardly shunned, just not preferred. Besides, I don't think Atlassian is interested in competing for heavy users that don't pay anything. They are pretty content with the enterprise IT market.
