I did a nice talk about Monero chain analysis at Monerokon. Things are not that straightforward as they look. Not creating a permanent record of a transaction has its benefits.

Yes, lightning was designed as a scaling solution, but it does not mean it can't have privacy as well.

https://juraj.bednar.io/en/blog-en/2023/01/13/monero-and-lightning-privacy-what-do-the-haters-get-wrong/