This is true, but a couple dozen Cashu mints that require no authentication or KYC already exist:

Bitcoin Mints

NWC is only used by Alby AFAIK. The only reason to favor Cashu is the current ecosystem that supports instant anonymous wallets.

Not only Alby, check out

GitHub

awesome-nwc/README.md at master · getAlby/awesome-nwc

Curated list of awesome projects implementing Nostr Wallet Connect (NWC) - getAlby/awesome-nwc

for a full list of wallets