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I think your comment is affirming my statement implicitly. For the things you want to do with a centralised database they are very similar. Given the entirety of things you can do with a blockchain then are very different. You view email and phones as very different, because enough time has passed for those differences to become obvious.

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No, I think there's clear objective attributes that are different. Email vs. phone: async vs. sync, recorded vs. unrecorded, etc. The only real difference between blockchain vs. standard db is anyone can write who has 'x-coin' vs. trusted authority can write, and I argue that the difference really isn't that important.

I think if you replace phone with 'answering machine', his logic makes more sense.

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