Here's one radical suggestion for you - we remove all the built-in stuff for jacking-in/connecting to something as a ClojureScript REPL and leave the possibility to upgrade a connection as something separate. Even today the cljs-connect is kind of fake, as it's a regular Clojure connection that gets changed after the fact. This can be some step towards having again a single jack-in command down the road.

The ability to host both Clojure and ClojureScript REPLs on the same server is both a blessing and a curse and at some point we might want to decide which one is it primarily. 🙂