jj is what comes after git.

It can back on to git if you want, so a migration doesn't have to be all-at-once. It already has all of these features and more. It's stable, fast, very extensible.

jj truly is the future of version control, whereas git plus some loosely specified possibly proprietary layer is not.

I'm excited to see what ersc.io produces for a jj hosting service and hopefully review UI.