The biggest feature gap I noticed was the lack of hooks. Using Gerrit requires a commit hook to insert the change ID. jj's docs mention this specific use case,

The biggest feature gap I noticed was the lack of hooks. Using Gerrit requires a commit hook to insert the change ID. jj's docs mention this specific use case, but their workaround (using a custom commit msg editor command that wraps vim) feels hacky. Didn't bother looking further into it, not sure if this is a technical or ideological choice. Otherwise it reminded me about all the best parts of mercurial and git branchless. Pretty excited to get Fig-esque features in my external projects.