1. fuck the banks and govs (if you are smart)
2. no intermediaries (if you do not use custodials)
3. no fees (as receiver)
4. instant settlement
5. more privacy (adding a cashu mint could add more)
6. offline payments (see LNbits offline PoS and cashu), this is a huge advantage for street or mobile vendors
7. you could create your own ecash mint and build a circular economy based on that (see my guide example or what Cuba Bitcoin community did)
8. easy integration with multiple e-commerce platforms
9. possible to use it with nostr

... and some more but can get them in my head rn