It’s nice to see another option for mercurial. Heptapod will definitely help given an integrated CI/CD.
In my startup everything is mercurial. It’s miles ahead of git when it comes to user interface and experience with conceptual integrity.
Git is popular due to GitHub, for us we use self-hosted kallithea-scm [1] to provide workflow with pull request and review similar to GitHub. So far didn’t see the need to change, it’s just that we need to build our own small extension to integrate with CI/CD (here also buildbot [2] is quite nice). Another open source is sourcehut [3].
[1] https://kallithea-scm.org/
[3] https://hg.sr.ht