Yes, that is why I said [quote=Zero Hex]This wasn't quite the case, but it can happen.[/quote] 

As in, no, the GM isn't throwing in a concept that's past the middle ages this time around, but yes, he should be prepared for people pointing out that X or Y in his setting aren't medievally accurate if he's going to point out that A or B aren't medievally accurate when people try to use them for their posts. Comprende?