In git if you, say, do some `git rebase -i`, edit some commit, continue the rebase, and hit a conflict, and realize you edited something wrong that caused the conflict, your only option is aborting the entire rebase and starting over and rebuilding all changes you did.

In jj, you just have a descending conflict, and if you edit the past to no longer conflict the conflict disappears; kinda as if you were always in interactive rebase but at all points have the knowledge of what future would look like if you `git rebase --continue`d.

Also really nice for reordering commits which can result in conflicts, but leaves descendants non-conflicting, allowing delaying resolving the conflicts after doing other stuff, or continuing doing some reordering instead of always starting from scratch as with `git rebase -i`.