I don’t think simplified model is even the best selling point, but it’s definitely up there. IMO one of the killer features that you absolutely cannot get in git is universal undo. For example, rebases can always be a little tedious and tricky no matter how experienced you are. Not only does jj make that whole process easier and safer to work through, but if you do still manage to get to a state where you just want to go back it’s literally just an undo away.
I’d give [1] a read if you’re interested.
1. https://zerowidth.com/2025/what-ive-learned-from-jj/#commits...