Two quick points. First, if someone has fun spam crafting what's the harm?
Second, you could introduce a high failure rate that scales down as you get better, so you're wasting materials.
...point is, there are ways to balance it, but nay sayers need to get their heads out of the a16 box.
LBD was implemented poorly, which is why it failed.
...heck, the devs could learn by doing.