You are not forced by the language to wrap libraries. In fact "Programming Clojure" by some of the authors says the following:
"Clojure embraces java and its libraries. Idiomatic Clojure code calls Java libraries directly and doesn't try to wrap everything under the sun to look like Lisp. This surprises make new Clojure developers but is very pragmatic. Where Java isn't broken, Clojure doesn't fix it"
So the ecosystem is a superset of the Java and JS ecosystems, which are pretty developed.
I do agree that the cost of required to know 2 or 3 languages is real though.
"Clojure embraces java and its libraries. Idiomatic Clojure code calls Java libraries directly and doesn't try to wrap everything under the sun to look like Lisp. This surprises make new Clojure developers but is very pragmatic. Where Java isn't broken, Clojure doesn't fix it"
So the ecosystem is a superset of the Java and JS ecosystems, which are pretty developed.
I do agree that the cost of required to know 2 or 3 languages is real though.