Bookmarks in JJ are closer to tags than branches. They aren’t updated whenever you add new commits on top of the bookmark.

If you assign your bookmark to the current commit, yes, and I have done that before. But it’s very easy to not do that, and if you push the wrong commit (a WIP commit, let’s say) you can reassign the bookmark and then push again. It’s not a big deal to push arbitrary garbage to the remote if you do, and it’s not common that I do.

On the flip side, jj has been remarkably useful at ensuring I never ever, ever lose any of my work. Ever. It’s not an issue that often, but when it is, oh thank god

No, because `jj git push` only pushes bookmarks. If you `jj git push -c @` or create a bookmark, yeah, you will push the current commit, but then you're asking for that pretty explicitly.

Please try out Jujutsu.