One of the bigger selling points of JJ just wouldn't work so well without larger team buy in for me: the ability to push stacked PRs.

I like the idea of it, but there's so much inertia around typical git workflows that revolve around the GH pull request model (with the only difference being the use of trunk based dev or some git-flow like branching strategy) that it'd be hard to change without a lot of buy in.

I still think back to Phabricator and its approach to code review, noting that it sadly never got wider traction despite having notable benefits over a completely entrenched status quo.