I think a lot of people would disagree with you. There are obviously many methods besides proof-of-work to achieve consensus, but a blockchain cannot properly b

I think a lot of people would disagree with you. There are obviously many methods besides proof-of-work to achieve consensus, but a blockchain cannot properly be called a "blockchain" unless there is some consensus protocol. Not every DAG of digital hashes is a blockchain. Under your definition, every CBC mode stream cipher could be called a blockchain, which just makes the term meaningless. It was coined for a specific purpose: to describe how Bitcoin and related cryptocurrencies operate at a technical level, especially how they guarantee integrity and prevent double-spending.