No, it doesn't. It does make learning it practical considering it's what everyone uses.
If you think you can do better, please do! Let me know when you've gotten a few projects to switch over and I'll gladly learn that, too. Not a lot of projects using mercurial these days.
Practically speaking, anything mainstream that I actually use. And the "still" qualifier there is the problem. That number should be growing, not shrinking.
Ok. Mainstream... you use it..
How about:
nginx, sudo, pypy, mozilla/firefox, facebook?
And. totally agreed, the number should be growing (especially for such a nice piece of tech with a far better toolset). Now that you've signed on to learning, hopefully that will be the case.
If you think you can do better, please do! Let me know when you've gotten a few projects to switch over and I'll gladly learn that, too. Not a lot of projects using mercurial these days.