They do keep dragging a few here and there back into the light of day. I had two stacks of pine lumber for example, which became a thing again in 4.0. Things like the tiered beastman currency could easily be recycled for buying items for a new X weapon step, and so forth. The more 1.0 items can be brought back or repuposed, the fewer new things they have to cook up every other patch, so may as well let them lie fallow.