Outside of a few exceptions, dropped gear is just not dyeable?

Given that the models are typically reused as dyeable crafted sets later on, the reason is probably to save them time and money on having to design entirely new gear. We expect new content at a pretty fast rate, so they have to find ways like this to help facilitate that.

Though I think they could get the same effect from making the original drops dyeable, and then just swapping the models around to different classes when they reuse the designs later on.