At scale, you can't pay for coffee on a premium global blockchain. You'll need a peripheral financial ntwrk that settles on that blockchain.
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what product sits on the fence between layer 1/2? a concert ticket, dinner for two, a car? What does the computer science dictate here?
Computer science doesn't give anything like a precise answer. Engineerng says to allow ample margins for error if you want to remain secure.
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Can be confident that if one secure blockchain was used for all world's high-value txs, fees would be too high for most or all of your list.
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(and would cost way too much energy)
End of conversation
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Since all engineers have an opinion on what 'ample margins' means the only real answer is lots of competing products.
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Think of it terms of engineering safety factor. We don't build skyscrapers to just barely avoid collapsing. https://en.wikipedia.org/wiki/Factor_of_safety …
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Does ethereum still have those margins?
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