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> Assuming everyone commenting here has read the post

Proof of stake is mentioned at the end of the article.

> Other mechanism for securing blockchains exist and successfully used (see Proof of Stake). Proof of Work creates external costs (environmental impact, higher electricity prices, GPU scarcity) to benefit a small group of miners.

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How beneficial blockchains are is a separate question, but proof-of-work is popular because proof-of-stake has serious issues.

Indeed, I'm aware but felt it would be overkill to mention this when the person clearly didn't even read the whole article.

For people interested, look up the "nothing at stake" issue.

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