Now from my understanding of RNG, it's a Bell Curved chance.
What it means is:
The overall chance will shift with the average.
But from my playing of Diablo 3, it DOESN'T seem so!
If the loot system is truly RNG, then it means that the "normal drop" will be getting better!
Such as dropping Rare Items left and right! And the chances to drop items "on the left end" are significantly reduced!
But I "still" get a lot of blue, white, even gray items!!!
Maybe it because it's the "Standard Deviation" that was increased instead of "Average".
But then hell! You got "even more" chance to drop garbage items then usual!
What's the goodness in that!?!?!?