I get paid for haskell and I don't use category theory. No one in my team does and neither do a significant share of the people in the industry.
I don't know what outsiders think about us, but 90% of the value derives from the simple things : constructing simple datatypes easily, a world-class type checker and some great libs that require little knowledge to be used, like Servant or Aeson.
Sure, there are fancier things if you want to go beyond that, but you can be productive with the bare minimum of Haskell, as Elm shows.
I don't know what outsiders think about us, but 90% of the value derives from the simple things : constructing simple datatypes easily, a world-class type checker and some great libs that require little knowledge to be used, like Servant or Aeson.
Sure, there are fancier things if you want to go beyond that, but you can be productive with the bare minimum of Haskell, as Elm shows.