It's just custodial lightning like WoS with the added benefit of privacy and offline usage. It's not an ecash thing, it's just lightning. The advantage over fiat is that you can choose who to trust, anyone can run a mint, could be someone you know, unlike a bank, and you can move your funds quickly. But yes I get your point, onchain bitcoin and running your node for lightning are the most trustless options, but dealing with lightning is very hard, onchain might be expensive so people go to custodial solutions. This is a problem if onchain fees get too high and becomes hard to self custody.