I don't care if I lose the stuff in my post master, I don't use it for storage anyways but having to spend minutes slowly dismantling blues is just a pain in the -blam!-. There is practically no difference between the rarity of blues today vs before the "reduction". Let us toggle it or turn it on automatically once we reach the soft cap.
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If they can't figure it out they should just stop them from being sent to the postmaster. Postmaster should be for legendaries, exotics, special mats (cores, prisms, golf balls) and any item that gets kicked there from a quest if your inventory was full.