Interesting; despite being chronically online I hadn't actually heard of Jujutsu before. I like the idea of a better VCS still using Git under the covers, if for no other reason so that I can continue to use Github or Gitlab to back up and share my code with people. I've never been able to stick with Fossil or Bitkeeper even though they are both very neat because they've never been "sufficiently better" to override the network-effect of Git's popularity.
I'll need to play with this. I don't know that I'll stick with it but I'd be happy enough to be wrong.