I agree, the privacy implications are one reason it's so useful. I'm not against cashu. Just pointing out that for most people using it, it is still essentially custodial lightning, albeit with some other benefits like privacy.
The problem is that people are going to trust these custodial services no matter what we tell them. So I say do away with the traditional custodial lightning, and move it into cashu. How to get users into self custody is the delimma.