Despite the small pool of legendary weapons we have in D2, with random rolls, just one weapon can equal like 10 different guns due to perk combinations. If they want to keep static rolls, they need a very large pool of legendary weapons to compensate for the removal of the RNG weapon rolls system. Problem is, they didn't do that, and then when you get a weapon that you dismantle every time, you will always shard it because it was no different from the ones you got before.