The personal data is somewhat vulnerable, but the actual money is more secure.
This is very important. It is nice that a purely distributed system can essentially achieve non-reversible transaction, but that's not something that most people need. Most people need reversible transactions, where the reversibility is controlled by adaptable laws and regulations that are ultimately interpreted by other people.
Distance selling is very hard, as money and purchase change hands asynchronously at a distance and the purchaser can't inspect beforehand. The potential for error and fraud (on both sides!) is high, and realistically this requires the intervention of third parties to investigate and arbitrate disputes.
This is very important. It is nice that a purely distributed system can essentially achieve non-reversible transaction, but that's not something that most people need. Most people need reversible transactions, where the reversibility is controlled by adaptable laws and regulations that are ultimately interpreted by other people.