would start to dull down the game

I don't really follow the logic that you feel it's unnecessary that you can't just gather as many mobs on you as possible in an area with no threat of being knocked off your mount,gold wow or slowed down while running. Should it really be considered an inconvenience that a bunch of mobs striking you can do nothing to slow you down? It seems like you could then apply the term "inconvenience" to a lot of aspects of gameplay, but at the end of the day removing those inconveniences would start to dull down the game.