I am confused - I love JJ and stacked diffs with Gerrit and Phabricator, but trying to port that same "each commit gets reviewed individually, and things don't

I am confused - I love JJ and stacked diffs with Gerrit and Phabricator, but trying to port that same "each commit gets reviewed individually, and things don't break when a half-reviewed stack gets rebased" workflow to GitHub has been a nightmare, how does JJ help?