Because that requires them changing the game, whereas not-hoarding only requires a behavioral change on our part.
One's much easier to do than the other.
Change is a good thing. Also multi perk items are in game so the idea is already there.
Vanguard, crucible, gambit and adept raid weapons can have up to 6 perks on the right 2 columns.
Most recent ones i believe are the adept Salvation edge weapons that come with 6 perks. Vanguard, crucible and gambit just requires multiple resets for multiple perks.
Collectors like me just want the same option for our exotic class items.
But I understand where you're coming from, they let go alot of their employees so change would be hard.