Why ecash is so much better than your normal custodian:
- it can be audited as easily as any custodian
- users have way better privacy
- users can make payments peer to peer
- it supports smart contr...
expressing in different words, an improvement is the possibility to delegate settlement of the transactions to mints, making it more efficient. Routing from a bank to another would be smooth, user would need to transact p2p in real life without need to think anything, its cash, it just works (unless it, at some point, will not work like when the bank is offline and so on... But this problem seems all solvable with time and developing new solutions)