It's kind of interesting that you're responding as if all of those three points are something against Clojure, when in fact they were cases in which Clojure would work really well. I made that clear.

> I assume these things are known and were discussed. Are there specific trade-offs that didn't work out?

As is always the case when a team switches programming language, the problem I described was the straw that broke the camels back for us. But fundamentally the issue in this case was "it sure as heck looks like we're trying to approximate class based dispatch inside of Clojure, this sure as heck is silly. Let's just use a language that actually wants to be used this way".