Yes but maybe I miss something. I'll answer point-by-point if you want.

• 1. openness: LN over nothing can interop with normal LN, and LN over Liquid can do the same. No difference here.
• 2. fragility: high fees are not that important over L2 such as Liquid, and flooding an L2 is unlikely. Not sure about griefing attacks.
• 3. prepayments: I wonder if Cashu can fix this problem for normal LN
• 4. hot wallet: wait what? why there's no signatures happening in Rumble? How would parties authenticate each other?
• 5. custodianship: LN nodes are not custodians, who says they are?
• 6. fun: no comment