One can be an expert on the various effects associated with nuerosurgery and indeed even the process of performing nuerosurgery without having actually done one.

Similarly, one can be an expert on how villagers fight, how to fight them, and the effects they have on the game without actually having played one.

There are many experts on animal psychology. How can this be if they have never been an animal?!?!

Asking someone if they have been/done X will never be a valid argument against their points concerning X.

All that said, I have no opinion on this matter. You though, need to take a class on "logic." Move along.