Because i do not want to allow other qualities to be specified. I was already attempting that and it always creates issues near crafting queue which is unable to handle quality. I would have to add a lot of safeguards such recipes never appear in the crafting queue, not even indirectly through ...

id like to create a mod that reworks the way quality items are obtained.
for example, you could craft an uncommon iron plate using a basic iron plate in a rolling mill.

but i dont want it to be possible to then use that uncommon plate to craft a rare one and so on, that would have a different chain ...