Except that the answer would simply be nonsense if applied to Clojure. It does too have safe, fairly lightweight concurrency, FP and immutable persistent data, both a standard library with all the trimmings and scads of add-ons (via Java), yadda yadda, modernity out the wazoo. What's it missing?

(I think the actual answer here is: mindshare. Respondents heard Lisp and assumed CL, maybe Scheme.)