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,

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.)