The argument here isn't really for the players that are already i90+. In the grand scheme of things, we don't need anything from the dungeon outside of Mythology/Soldiery Tomes, and anything we get for Seals/whatever is a bonus.

However, the DL gear (and new sets) that new players can use to continue to progress on their gear to get to Coil are too hard to drop. That's the problem here. Instead of putting Crafting Mats in the side chests, though, I'd put them as an additional chance on a 2nd loot item on the equipment chests. That gives you 3-4 chests per zone w/ Equipment+chance to drop a crafting item.

Yes, it's (relatively) easy to farm Mythology as a higher-level character. However, the people most affected by this problem are the people who AREN'T Higher level and who should be using this content to gear progress so they can do Coil/etc.