> Most people usually get there by getting hired in a place where the stack, library choices, etc. are made by people who had done haskell professionally befor

> Most people usually get there by getting hired in a place where the stack, library choices, etc. are made by people who had done haskell professionally before and have solved the problem you cite for the team. That's very true and the case at my job. We've taught people with 0 Haskell experience to write useful production code in under a month.