Not true, the mix of functional and OO features make the language complex even without the libraries. Throw in implicits, higher kinds, pattern matching, a fair

Not true, the mix of functional and OO features make the language complex even without the libraries. Throw in implicits, higher kinds, pattern matching, a fairly good generic type system, support for all kinds of polymorphisms (subtyping, ad hoc, duck typing), etc... and you can see complexity emerge pretty quickly.