Biggest issue we have with ecash now is that there are two competing standards with incompatible formats. I prefer fedimint because I want the money federated across mulitple juristictions, but I guess cashu is easier to intergrate.
Discussion
Afaiu, cashu's architecture is closer to nostr:
It's the user who decides which mints he wants to trust and store his sats on; there's no need for a federation of mints and trusting between them.
Simpler indeed.
We'll see how this space evolves.