I know pretty much nothing about Scala. Anybody cares for my criticism of its type system? And what's with Rust and those ampersands everywhere?

GP wasn't discussing the language in general, just a small feature that depends on an idiomatic pattern used in many other places, saying "it looks gibberish." Of course it does, because it isn't idiomatic for you.

You don’t need to know that to do the comparison. If I tell you to do the same thing in one language it’s “(!:;$&)” and in another it’s “array_contains”, you don’t even need to know the languages to have a reasonable opinion on which is superior.