I agree in part, but think you're underestimating the extent to which the 4e gameplay is intended to give a fantasy RPG experience. In this respect it's different from Magic: The Gathering, where the fantasy colour is very much subordinate to the gameplay. But even in Magic the colour is not irrelevant.in 4e, all is sui generis -- Radiant Blah exists because of a need to balance against other powers of that level and frequency of use for other classes, to fire up this ability against that defense. It's NOT trying to simulate a myth or a story in pulp swords & sorcery, or a historical/war gaming reality -- it's trying to create a balanced game, with a fantasy setting.
One thing I like about STR vs CHA paladins is that I have a way in the game rules of distinguishing between Lancelot and Galahad.Foes says, "Wait, I can attack with my sword using a CHARISMA modified to hit if I take this power for paladin. How the heck can use Charisma to swing a sword?