FWIW, I've seen people praise traits, but never seen any in depth discussion of their advantages and limitations with respect to, say, C++ polymorphism (both dynamic and static, via CRTP etc. for zero cost OOP) and trait classes. Similarly, algebraic types are frequently mentioned, but only with simple matching examples and scarce discussion of the limitations. I'm sure other aspects of the language I'm not immediately aware of also deserve more discussion.
Not your parent, but instead of writing my own thoughts here, I think I'll write a blog post tomorrow :)