I think ii is imperative to note that adversarial environments are what blockchains are useful for. They're not particularly efficient as a means of storing dat

I think ii is imperative to note that adversarial environments are what blockchains are useful for. They're not particularly efficient as a means of storing data, so if you can trust and/or rely on suing your counterparties, you don't want to conduct your business on a blockchain. Yet the blockchain hype seems to be much about banks setting up their own chains etc, which is complete nonsense as that would be little different from a regular database.