There are good ideas in functional languages that other languages have borrowed, but there are bad ideas too: currying, function call syntax without parentheses, Hindley-Milner type inference, and laziness by default (Haskell) are experiments that new languages shouldn’t copy.
I believe one of the main reasons that F# hasn't never really taken off is that Microsoft isn't afraid to borrow the good parts of F# to C#. (They really should've ported discriminated unions though)
loading story #47480090