Intuitive understanding gained by practice enough for you. If Haskell didn't exist, you could probably invent it. The result might even be better.

Neighbor, how much code is there in the world? And how many coders as good as you? Divide these numbers, and you'll see why the world can't possibly adopt Haskell.

Some people can climb Half Dome with their fingernails. That doesn't mean there shouldn't be a fixed rope, too - that is, if your goal is to maximize the climbers of Half Dome. (If its goal is to separate the men from the boys, Haskell is already doing just fine and shouldn't change a thing.)