It helps because not everyone has the perfect inventory. Sure maybe someone gathered too many items. Instead of selling them off to an NPC vendors it may take a while to clear them through the Market Board to try to make a little more money. Like cooking. I know I will do that last so I am selling off my cooking materials.
Add in different levels of DoW, DoM, DotH, DotL, where maybe you can't share equipment because the levels are too far apart, then you have multiple gear sets.
So, yes, until the crafters are the same level and can share the same gear, gatherers at the same level and share the same gear, melee dps, caster dps, heals, tanks, are all the same level as they are leveling up to share the same gear, we can indeed have an overflowing armory. SE releasing these items without letting us throw them into the armoire certainly does not help.