Recently I wanted to change my focus from crafting items to spirits, but then I realized something.
After reaching milestone for using less resources to craft, it also make u getting less resources for destroying it.
For the example on screenshoots one spirit is with milestone for less leather spend and other one is not touched yet.
That make no sense for me and make me dont want to craft them at all because with "eco friendly" skill I am getting nice amount of resources, but after mastering blueprints it is gonna be forever gone.
My suggestion is to change resource u get for destroying items based on base resource price not current, because it hurts players that spend time and resource to craft and ascend items.