is it just me or does a herb has no use
you can also use things like the scimitar which gets stronger the more things that're destroyed next to it, and things like chainmail which gives more block the more things that're destroyed next to it. this allows you to scale block and damage at the same time with just spaming log and smoking the herb
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.