Dave,
I believe that MPs should listen to the concerns of their constituents, you do not.

That is not true.
I consider it a jewel of our system that constituents can take relevant concerns to their MP even if it is the Prime Minister, but some concerns are just not worthy of any MPs time, e.g. obscene cloud shapes and old arguments about Brexit.

He could have got the answers to his questions from any one of us. We have been over it enough times and we do not have a country to run.
He could have gone to his local. Everyone has seen those questions put and answered many times. You do not need to waste any MPs time when others are waiting with real and relevant concerns.