Indeed. This has always been the case for abstracting away from the underlying asset; it improves payment speed, reliability, optionality, etc. The nice thing about eCash is that it makes these improvements over custodial Lightning while maintaining the same trust model. The thing that drives me nuts is when people characterize the trust model of Cashu as fundamentally worse than the trust model of custodial Lightning. They're both IOUs that are only as good as the custodian is honest. Perhaps the main issue is that there is such a low barrier to entry to run a mint that users may be more likely to come across some random mint that rugs them, whereas custodial Lightning is typically taken on by businesses trying to build a brand and reputation, so the rug-risk is naturally lower. However, the trust-model itself is exactly the same. Even that can be mitigated with eCash by spreading your risk among multiple mints, so that if one rugs you, it's a minimal loss.

my only concern are people coding to an ecash interface instead of a lightning interface. that would be pretty bad for self sovereignty.