D&D 5e has almost no crafting (well except for mundane crap like arrows and weak consumables; technically you could craft non-magical weapons and armor, but the amount of time and resources it takes makes it just not worth it). Unlike previous editions of the game (D&D 2e, D&D 3.5, etc), magical crafting has almost no support (if any). For these two reasons, I doubt that there will be extensive crafting support in BG3. Would I like to have crafting support? Yes. But I don't really see it happening outside of say making arrows, poison, or potions of healing.