Well, if the intent is to design something familiar, it isn't at fault, but otherwise I agree.
Oh, I don't know. I think things like axes and swords, chain armor and plate, bows and cavalry, and such are "typically" medieval when it comes to RPGs. Throw in magic, wizards, elves, dwarves, etc. and you get the "fantasy" aspect.
Otherwise, yes, the middle ages or medieval period spanned hundreds of years, so at what point in the medieval period you want can differ, but all are commonly established IMO. Samey is good at this point, YMMV of course.