If you have a stockpile of Iron Horde Scraps, whether that be due to disinterest in transmogrification or already possessing all of the items you want, you'll be able to put them to good use in patch 6.1. While the War Mill and Dwarven Bunker are already a steady source of follower equipment, patch 6.1 implements a daily quest wherein you can trade 25 Iron Horde Scraps for an additional piece of gear.
When you turn in the scraps, you have a choice between an Armor Enhancement Token or Weapon Enhancement Token -- the same items you can earn through select follower missions. That means there is a random element to the reward, your ultimate outcome being anything from a three ilevel improvement via Braced Armor Enhancement to an automatic ilevel 645 via the far more rare Goredrenched Armor Set.
If your garrison has been running a Salvage Yard and War Mill/Dwarven Bunker since launch, you most likely have a stockpile of follower enhancement items already. If you haven't had those running for months, this daily quest will be a solid catch-up mechanic.