You are 100% wrong that Destiny weapons mean more to a player than Weapons in an mmo. Legendary weapons are still sought after to collect in WoW Many people spent months grinding out one Legendary even if it was already obselete because it means that much to them. Destiny in an MMO Hybrid bottom line. Also Yes Destiny expansions do happen faster than mmo Expansion but around the same rate as a Tier in WoW which is where most gear is phased out not during the expansion.