Transferring money from one country to another. It might seem easy right now, but if Visa or MasterCard ban you or your recipient, or their region, or country then it becomes much harder.
Every instance of international money transfer being more difficult via Visa/MasterCard than Cryptocurrency is by design. When you hear about a government issuing new “sanctions on North Korea”, for example, those sanctions are implemented by making it prohibitively difficult to effect transactions with North Korea.