What is the argument for "need BOE for AH"

Unless stated otherwise by the party leader, the implicit agreement is that need/greed works like the implementation so obviously states - Need if you need, press greed if you're greedy for the item, or pass if you don't care.

If you join or create a group and start needing everything without the agreement that doing that is ok, what you're engaging in is simply toxic and selfish behaviour.

Fucking spot on. Well said.