1) Years ago? LN is barely a year old. You're mixing shit. And if you're referring to the fact that no pizza restaurants accept LN yet, well, that's criticising adoption, not the technology.
2) Hahahaha, KYC? I haven't found any LN payment hub that required me to show them who I am. What FUD are you spreading? This statement alone reveals you already as some kind of shill, trying to spread misinformation by deceiving.
3) The OP is already saying that it was not LN that failed, maybe something on his side (internet connection?). Anyway it could be true that UI/UX is not the best at the moment, but we all know this takes time to polish. There's no design flaw that prevents LN to have a decent UI/UX. This is just the equivalent times for when Linux OS didn't have a GUI, did that mean that Linux was useless?
I'm not sure I follow your point here. Are you implying that only 2 pizzas have been purchased using LN?
https://bitcoinmagazine.com/articles/debunking-the-most-stub...
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