Only your main point is potentially valid for LN. And even that I'd be highly skeptical.
Years ago, LN was used to buy two pizzas. Today? Only two. Talk about scale!
Second, user privacy is utter untrue mainly due to all the hubs (of the hub/spoke network) are KYCs. That's the opposite of privacy.
Third, usability currently you need hot wallets which are a terrible UI/UX. Even the beloved LN Trust experiment is having hiccups [1].
[1] https://twitter.com/paul_ferguson/status/1111097073510699008