I tried it after using Emacs Magit for about six or seven years, and jujutsu is really easier to use than git and useful if one wants a tidy public history of changes (Linus Torvalds recommendations on that linked here). Plus it is fully compatible to git as backend - other contributors will not even note you are using it.
The git compatibility is necessary for adoption and connected use.
jj does significantly reduce the work interface, but the git compatibility increases complexity again.
I tried it out a little bit a few days ago, and found it interesting. But given my git knowledge and tooling, I can’t reasonably switch. First, I would miss my TortoiseGit Log view (entrypoint to everything). But also, the connection between jj and git seems complex and potentially error prone.
As a fresh and independent tool I can definitely see how it’s much easier and better, especially for people not familiar with Git.