It’s a ‘wallet’ that can exist across relays (and across jurisdictions) so there is no,single point of failure, aside from protecting your the nsec. I have the redundant relays working, now focusing on mult-mints so you can swap your proofs between mints if you suspect of them.

As for ‘why’ - it’s an experiment- ‘can I keep stuff securely in the nostr network?’ - so far successful 

 If you are issuing Cashu tokens, Your single point of failure is the mint. You can’t get around that with stacking it above Nostr. 

 The mint is one of several providers that can issue tokens. The wallet just holds them and redeems them for payment. I can choose and shift between mints as I choose. Agree with the point-of-failure argument, but mitigating against a single point of failure.