This. Whenever someone says that Cryptocurrencies solve money transfer problems, I look where they are based and 99% of the cases it is the US. In Europe, transferring money is the same internationally as it is nationally. Type in the IBAN and the name of the recipient and they get it the same day, or latest the next day. I made seven figure international payments that went through in 24 hours.
This is not a technical problem that Cryptocurrencies are somehow uniquely placed to solve. Technically, a money transfer could take miliseconds - updating a couple of database rows. National payments in Europe at least are actually pretty much instant since they are now fully automated. International payments can take up to a day due to an actual human checking the correctness (and perhaps doing due diligence for money laundering).