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Szabo wrote about this back in 1999: https://nakamotoinstitute.org/library/micropayments-and-mental-transaction-costs/
Small payments (which might include what people now call "value for value" as well as "zaps" or other very low value payments) have too high a hassle factor (not because of the tech so much as the irritation of needing to spend mental effort on such low value things).
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good question
IMHOP these can be addressed with precisely the tech eCash will have such as thunder and bitnames, UX designed around these for example will beat banking UX, even today
let's see what Paul says
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what is a "mental tx cost"? The difficulty to do one on lightning ?