If I may ask, how much time have you spent trying to learn use jj? I ask because I've seen a strong tendency for people to who have never used it to argue again

If I may ask, how much time have you spent trying to learn use jj? I ask because I've seen a strong tendency for people to who have never used it to argue against it. I see much less arguments against it from people who understand both Git and jj well. But that's just my impression; I may of course be wrong.