Racket is one other good example but he was responding to the "all other lisps" claim. Racket pretty unusual in many regards, so I think the Dwightian "False" was unnecessary here. Or anywhere, really.

Clojure is a more opinionated language. It has a BDFL who has really stamped his mark on it. This is very much reflected in the standard library and the built-in syntax for the standard collections. Sure, nothing is stopping Racket from doing everything Clojure does, however defaults do matter. Once a language reaches critical mass, it becomes very difficult to change without breaking everything.