> Blockchain is built from the ground up to prevent exactly one type of security vulnerability: man in the middle attacks. It is absolutely abysmal at protecting against any other form of attack.

I wonder where that Man in the Middle attack thing is coming from? Dan mentioned it in his recent video, so he must have picked it up somewhere.

If you Google the term + blockchain, you'll mostly find some discussion about potential attack vectors regarding wallets. It's not a term used in academic blockchain literature as far as I aware. It's not used in the Bitcoin whitepaper.

Man in the middle has a specific meaning, and I don't see how describing blockchain's main purpose as preventing this kind of attack makes a terrible amount of sense.

Ultimately, what you critique is simply an inherent part of the system. These are not oversights. These are basic consequences of the whole approach. To say "blockchain evangelists suffer a deficiency in not addressing them" is merely saying "there should be no blockchain evangelists".