Clojure code is surprisingly hard to edit for a Lisp-like language. The gratuitous use of square brackets where a Lisp would just use parentheses is part of that.

Omitting the parentheses inside those square brackets, however, was an even worse decision wrt editability. When you can't edit a sequence of syntactically homogenous items by simple s-expression manipulations, your Lisp's design is defective.