The actual user experience of SEPA is 2-5 business days just like America's oh so antiquated ACH system.
There are some very specific edge cases where SEPA instant exist, and that edge case may work for a large number of people that live in that walled garden.
That garden seems to be same country to same country transfers, where both banks have SEPA instant.
But to make it seem like the Eurozone or SEPA participant network has this solved has been very disengenious.
I frequently sent money to foreign countries and never experienced taking it longer than one day.
Oh, and it's free too.
This happens. Both are (most of the time) reversible in standard banking.
Fortunately the sum was trivial, but nevertheless ...
The value of cryptocurrency is inversely proportional to how functional the regular digital banking system is.