I sometimes wonder what would have happened if Atlassian had stuck with Mercurial support on Bitbucket - I don't think they can pretend that switching to git did very much for them. I love(d) Mercurial, and particularly TortoiseHg integration on Windows.
Though at some point I would have realized that Atlassian was the wrong fit for my needs as a single-dev, no-AI project and switched.