INT > Advanced Engineering Level 3: [...] All forge recipes cost 10% less, crafting Forged Steel and electrical devices costs 15% less.
INT > Advanced Engineering Level 5: Learn to craft SMG auto turrets for the best ranged base defense, and crucibles to forge steel in forges. [...]
What use is it that crafting forged steel becomes cheaper at level 3 if I can only make it at level 5 (Crucible)? Yes, I could find or buy a Crucible beforehand. But what if not? Then it's pretty pointless like that ...