You could say exactly the same thing about gift cards, yet gift cards have obvious utility.
ecash tokens should be seen as a 'promise to redeem bitcoin', not a place to store wealth, but rather a way to perform:
  • Micropayments
  • Offline transactions
  • Private payments
If you receive enough ecash tokens, your first priority should be to redeem them for lightning or on-chain in a way that makes sense (for the amount you receive).
ecash does not replace lightning, nor self custody. It is a level 3 that trades security/trust for scalability/privacy.
You wouldn't keep $10m in your pocket. You wouldn't put $10 in a bank vault.
TLDR; You are right, ecash is fiat bitcoin (faith in the mint) and it is quite valid to position it as such. It's not a bad thing though.