[jsgf]

Tech lead of Mononoke here. Thanks for your comments!

The experience of using Mercurial within FB is quite different from the stock open source one. We have many local extensions, as well as integrations with the rest of our developer infrastructure. We're definitely optimizing for the linear-history monorepo model.

We don't see things as a competition between hg and git, but between good developer experiences and bad. Thus far, we've found it easier to improve the developer experience with hg than with git, so that have been our main focus.

But we feel we're reaching the limits of what we can do with hg, which is why we're investing in Mononoke. We feel that version control in general has been pretty stagnant, and we're hoping to do some neat stuff over the next few years (based on Mononoke and other projects).