Yeah I guess it confirms your point in a way too.
There's nothing keeping me from switching except the activation energy cost. Almost every aspect of working in my area (Linux kernel) is painful so I'm constantly investing in tooling and workflow stuff. So usually I just don't feel like investing EVEN MORE in the area of tooling that's probably least painful of all.
So yeah this is still basically a recommendation for people to try JJ!
What really kept you from staying with it? It does seem like if your workflow involves a lot of nasty rebases you'd reap dividends from something like jj. I was also someone who'd mastered git (hell, I've written a git implementation) so I get having its patterns deeply ingrained.