Not necessarily. I used jj for a couple of weeks and found it to be a complete waste of time.

For an advanced user, it did not offer anything I cannot quickly solve in git. Which is probably the wrong thing to optimize in the first place, because even though I frequently rewrite history and split commits during normal worklfow, it takes so little time that improving something else would yield greater returns.

We (not royal we) don't usually go out of our way repeating negative experiences with these tools, so you build a very skewed view of their adoption.