What triggered me was the proposed Arc<dyn TRAIT> as a quick fix. I was highlevel rustin along the learning curve as the article describes until i stumbled uppon dyn-compatible types and object safety.

It is too easy to trap yourself in by sprinkling in Sized and derive(Hash) ontop of your neat little type hierarchy and then realize, that this tight abstraction is tainted and you cant use dyn anymore. As a follow up trigger: This was when i learned derive macros :)