Unified mechanics defeat the feel of old school play. Different game elements require a variety of ways to model them. Trying to get every element to fit in the same size box follows the principle of having the game serve the rules which is the opposite of old school philosophy.
I am pretty sure this was a statistical anomaly, but the first time I watched a 3.5 game in action at our local gaming store, the d20 was rolled so much that it never seemed to leave the hands of the players. They rolled it so often that they also started rolling it to decide which direction to go when passageways intersected. Probably not the best example of game play for an impressionable 46 year old to experience.
