A demonstration of empathy that translates to real communication with the particular lay person you are engaging with regard to your domain of expertise shows mastery rather than mere proficiency.
Agreed, the important part about being concise is not that you can boil down a complex idea into a short statement, but that you can give the questioner the information relevant to them. When there is too much relevant information to be concise, that is in itself a relevant (and concise) answer, the art is giving the questioner just enough information to ask another question.
Personally I find doing that sort of thing _extremely_ difficult, and doing it in real-time as part of a verbal conversation orders of magnitude more so.
A demonstration of empathy that translates to real communication with the particular lay person you are engaging with regard to your domain of expertise shows mastery rather than mere proficiency.