To me, it makes jujutsu look like the Nix of VCSes.

Not meaning to offend anyone: Nix is cool, but adds complexity. And as a disclaimer: I used jujutsu for a few months and went back to git. Mostly because git is wired in my fingers, and git is everywhere. Those examples of what jujutsu can do and not git sound nice, but in those few months I never remotely had a need for them, so it felt overkill for me.

It's the dvorak of git... Maybe more efficient but incompatible with everyone else and a very loud vocal minority.

You can find this pattern again and again. How many redditors say 120fps is essential for gaming or absolutely require a mechanical keyboard?

Tbf you wouldn't use/switch to jj for (because of) those kind of commands, and are quite the outlier in the grand list of reasons to use jj. However the option to use the revset language in that manner is a high-ranking reason to use jj in my opinion.

The most frequent "complex" command I use is to find commits in my name that are unsigned, and then sign them (this is owing to my workflow with agents that commit on my behalf but I'm not going to give agents my private key!)

    jj log -r 'mine() & ~signed()'

    # or if yolo mode...

    jj sign -r 'mine() & ~signed()'

No, jj is super simple in daily use, in contrast with git that is a constant chore (and any sane person use alias). This include stuff that in git is a total mess of complexity like dealing with rebases. So not judge the tool for this odd case.