Different techs with different compromises.
Fedimint also exists.
I like the "simplicity" of cashu. It helps making for better custodians.
Discussion
I respect that of course . I only try to understand why everyone crazy with cashu. lol
In Nostr, I think it's because it can be seamlessly included to your sub so that you get zap ability without setup as a user. See NIP-60 (https://github.com/nostr-protocol/nips/blob/master/60.md)
Transmitting cashu tokens is as simple as transmitting some text. Redeeming requires communication with the mint.