Where have you seen wire transfers processing instantly? It takes 3 days minimum. This is the traditional banking we are speaking about. Who the hell told you it is instant???
There are some countries with systems in place to allow instant transfers. The Single Euro Payments Area (SEPA) are in the process of setting up a European wide payment processor called SEPA Instant Credit Transfer (
https://www.europeanpaymentscouncil.eu/what-we-do/sepa-instant-credit-transfer) which should allow instant transfers between accounts at any time of day or night. Whether or not exchanges will start using this is another matter, but it is certainly possible.
Most SEPA transfers reach no later than the next business day these days, and depending on the bank/country transfers under 15k EUR are near-instant as in your link. It only applies to EU/EEA/EFTA+microstates, though, other European countries such Russia, Belarus, Ukraine, the Caucasus, and a handful of Balkan countries aren't covered (...yet).