???? ??? ????? ???? ??? ??? ??????? does not translate to “to ask questions and then not answer them”, rather, it means to start something and not know how to finish it.
The Rambam’s answer was that it’s not comprehensible to the human mind, and the Ra’avad didn’t feel that it was worthwhile, therefore, to bring up the subject. That’s how I understand the Ra’vad (that disclaimer is a bit superfluous considering my screen name).