My gut answer to my interpertation of the question is No, it does not. Role-playing is about a series of choices, the mechanic of which is unimportant, IMHO. I get what Buzz is saying, though. Certainly, even when my players were throwing around god-like powers at high-levels, the main relevance came from RP-ing choices, not from dice-rolls. One of the coolest moments in the game was when the paladin used his Lucid Dreaming skill to create a permanent dream memorial to the fallen friend of the party. It was a use of a game mechanic, but the motivation and execution were what stayed with us.