I agree, add the copper cauldron to that. It could have some brewing mechanic or even be a purely aesthetic alternative.
Bane of arthropods should apply to it.
But it should take a long time to fill up, otherwise it just makes manual harvest obsolete.
But wouldn't you walk through the biome once and destroy it permanently?
I agree that they are too hazardous, but this could be alleviated by having frequent connective blocks between both sides so you won't fall down far; or making sure there is water at the bottom.