This is what i dislike about the argument that PoW should be banned - that it wastes energy that could otherwise have been used for something else. I argue that it is not a waste, because the person who is paying for the energy does not consider it a waste. No one else can make this judgement.

The only weakness of this argument is that some energy sources have externalized the cost of emissions. I would very much like to see an emissions tax to account for it (which makes sense to do, regardless of one's position on PoW).