I think monero's ring signature tech is cool, I like that it enables something similar to coinjoins but without needing everyone to sign something. It's better than doing a coinjoin unless you can get more than 16 people to join you in your coinjoin.

I also think monero's amount encryption tech is cool and better than the encryption standard we use in the lightning network. I wonder if we can adopt it in the lightning network. Their encryption standard has a feature called "perfectly blinding" which means that even if the encryption mechanism gets broken in the future, the data you get is still worthless without the decryption key. Lightning uses a less robust encryption standard and if it gets broken in the future, it would suck very badly for historical transactions.