Ok, so there's these two schools of thought. One, that player characters are special in the game. The other that they are not special.
If you adhere to the first, everything makes sense. The player character human is magical and can do crazy stuff because it's assumed he's special.
But if you adhere to the second, things kind of break down because player characters can have classes and magic and preternatural abilities that only special people should have...and yet, we're saying they aren't special?
Like I said, if we say some people can do these things but most people can't, so the ones that can are the exceptions, and the player characters are always exceptions, great!
But if someone starts saying "some people can do these things but most people can't and player characters aren't particularly special or noteworthy in the world" and yet just about every player has these special traits...yeah.