I don't really feel that way. In fact, I think that there's just so much going on in Haskell that it kind of frees me from having to understand it all. Being co

I don't really feel that way. In fact, I think that there's just so much going on in Haskell that it kind of frees me from having to understand it all. Being comfortable with fundamentals of purely-functional programming (basically ADTs and use of first-class functions e.g. with maps/filters/folds), and the essential types and type classes (Functor, Applicative, Monad, State, etc) give one enough of a grounding as to be able to write pretty much any program one could want. Sure, I could try to learn lenses, or the parallelism libraries, or software transactional memory, or DataKinds, or the infinitude of Ed Kmett Prosemicofunctor type classes... or not. If it turns out I need those, or I think they'd be particularly useful, I can learn them, but I don't need to. I'll never know everything there is to know, so I don't feel an obligation to.