Comment by sfink

Before jj came along (or rather, before it reached my threshold of awareness), I was such a person. Started with git, switched to mercurial, wanted to work against github so tried sapling, loved it and started telling people about it.

I probably would have stuck with Sapling, but my company switched to git and the jj integration was cleaner -- especially being able to run in colocated mode: your project root directory has both .jj/ and .git/ subdirectories, and you can use both jj and git commands without much trouble. If someone gives me a git commit hash, I can just use it directly with jj.

Sapling is good. I'm still fond of it, and in fact still have a few repositories I haven't switched over yet. But being able to do everything with a single tool is useful, plus jj gives me some extra capabilities over sapling (or at least things that I don't know how to do as easily).