Yeah, maybe that’s inevitable.
Second attempt:
Mats aren’t deterministic, but instead, they satisfy quality requirements. Going back to my shaman gear example. Say, you’re making some chest piece that requires “a conductor”, metal thread of pretty much any kind would work, but the liquid goo off opulence gives you better conduction than, say, the metal wires dropped by Mecha gnomes. Let’s say the price has 5 items it needs.
X amount of scales, conductive thread, padding, oil, and some magic catalyst.
Any scale would work, but some thunder lizard bosses scales would yield the best results, but literally kind of scales would satisfy the requirement.
Same for the conductive thread. Spinning golden opulence blood into thread is better than junk wiring, but you could use either (at the lost of a few item levels).
See what I’m getting at? Basically, for whatever content you do, you can craft gear at that level.
So, if you do all world quests, never step into an instance, and you make this out of mats available to you, you get an item level 385 with + nature damage on it (just an example). If you’re a m+ fanatic, you make it out of boss parts and get a 410 piece, same stats, just higher item level. If you’re a mythic raider and you sew in opulence goo and Jaina fingers nails, you get 420.
Tiered crafting.