A way of understanding “simple” in “Simple is not easy” is that simple things/designs/programs/values are those that are easy to manipulate. And that requires a structure, which might not be easy to grasp or come up with naively.
FP, especially in expressive languages like #haskell and #purescript emphasizes abstract reusable structures exactly for this reason of easy manipulation and hence simplicity. The associated learning curve makes it indeed not easy.
But “easy” in all of this means “free goodies without effort”. The opposite is not the discouraging “undoable and impossible to learn so don’t even try” at all.
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