To me, an obvious benefit of using jj is the power of the tooling and how intuitive it is to use. Once you have internalised the mental model, it doesn’t take many commands to achieve what you want.

For those who still do code review, jj is so intuitive and powerful that you can juggle around changes every which way to fit a workflow. Most of these workflows would be so difficult to achieve in git, that you might as well not bother.

https://ben.gesoff.uk/posts/reviewing-large-changes-with-jj/