Dutchy actually with herbalism you can allready make several potions at the same time.
So you can actually craft the potions in en masse.
With smelting you can do that as well. (I have done smelting together place 10 copper ore inside, the forge, and you either succeed and get 10 ingots or none at all:)
With carpentry though it is not like that, you have to saw through each and every chunk of wood, and do templates each separatly.
Same with smithing, there you make items one at a time.
So i think forging is okay, smithing, woodworking and carpentry need that what you mention.