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.)

It is true, Lisp means any Lisp, and it is specifically noted on the advertised poll that all Lisp dialects are included.

It is also specifically noted that Lisp programmers who use Lisp part time have right to write why they do not use Lisp - when they do not use it.

There is a huge variety of reasons and ways people think.