KidSnide
Adventurer
It's more a matter of sacred cows than anything else. You and I might agree, but my gut says that if they completely divorced ability scores from attack rolls there would be much wailing and gnashing of teeth.
I'm not sure about that. I don't think divorcing ability scores from attack rolls violates tradition any more than having attack rolls based on Constitution, or any other ability score that that requires rationalization to justify.
Classes could even provide "melee", "ranged" and "magic" modifiers that were used with most attack powers. (...and I don't see any reason why a minority of powers couldn't continue to be based on stats.)
-KS