Agree, for the most part, but I think records and pattern matching are essential. I started using Scala (2.x) in 2014 or so, and case classes and pattern matching completely blew my mind. if/else trees and switch statements felt so archaic, limited, and verbose after that. I used to joke that Java would eventually adopt enough of Scala to be a pleasant language to work in, and I don't think I was that far off.

(I'll ignore Kotlin... I don't get why people like it.)