never, because you will have many cases where you don’t share mint with the recipient
what do you use then? Lightning!
this is the exact same as everyone reinventing trains.
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we can get rid of the special case for when there are no overlapping mints, and instead just use lightning
if it’s the same mint it’ll immediately succeed so who cares
also why do we need cashu now, we can just directly generate LN invoices
oh wait
Nope, they receive the untrusted ecash to their NIP-60 ecash wallet and swap it to a trusted mint or lightning wallet later, on their own time. This moves the error case from the sender to the recipient.
It's just a better system for zaps.