I don't think these claims have merit, for the most part. More often than not, people just don't take any time to learn git, then get on a soapbox about it.
If you think these commands are worthwhile, by all means use them. I happen to think git rebase is all you need. Giving people crutches to avoid using it just delays their enlightenment. But not everyone reaches enlightenment, it's true.
I don't think jj adds anything compelling over git either. But different strokes for different folks...