Less than 20 irreversible transactions per second. Regular financial infrastructure requires maybe a few weeks or months or years for a reasonably irreversible transaction.
Layer 2/Lightning can process far greater number of transactions for a far lower fee with a cryptographic guarantee of submission to the underlying blockchain. There are some kinks of course, as there always are.
> today you learn that wire transfers are not irreversible
Nope. Reversing wires on bank error requires both sides’ consent. (Some wire agreements have you authorise the bank to do this on your behalf.) Less a reversal than sending a counterbalancing wire. Even this is only possible for minutes to a day.
Beyond that, e.g. in cases of fraud, law enforcement must freeze and seize.