A few examples of differences that could save money. The protocol processes everything without human intervention. Updating and running the cryptocoin network can be done on the computational margin of the many devices that are in everyone's pockets. Third-party integrations and marketing are optional costs.
Just like those who don't think AI will replace art and employees. Replacing something with innovations is not about improving on the old system. It is about finding a new fit with more value or less cost.
> Updating and running the cryptocoin network can be done on the computational margin of the many devices that are in everyone's pockets.
Yes, sure, that's an advantage of it being decentralised, but I don't see a future where a mesh of idle iPhones process my payment at the bakery before I exit the shop.