Maybe I misunderstood the topic as the poll itself isn't linked on the blog, but I got the idea that this is a poll on "what topics would you most like to learn

Maybe I misunderstood the topic as the poll itself isn't linked on the blog, but I got the idea that this is a poll on "what topics would you most like to learn more about?" and I would guess that most Haskell programmers are very comfortable with Functor, Foldable and Monad already.