True, they are of limited usefulness, but in Emacs you could (probably) make them more useful over time by exposing more and more sharing -- but (I'm again gues

True, they are of limited usefulness, but in Emacs you could (probably) make them more useful over time by exposing more and more sharing -- but (I'm again guessing, don't know Emac's insides) it might be easier/safer to start sharing nothing, then work on sharing as much as possible, rather than start with full sharing and then try to make everything work.