It has use for the potion cauldron, as well as any other items that get bonuses on destruction. It's not better than any other consumable that provides benefits like the fish, but it does have use.
You can use the oak wood (herb creation for 1 energy) + potion cauldrons to make potions every turn, and if you face a weak enough enemy you can get infinite potions (with enough armor scaling so you can live). Then you can get the potions that give you items, which can give you golden whetstones, which can get you infinite damage. That being said, not worth the effort. But it's fun to do once.