Single-argument doesn't capture the difference between functor and applicative.

  ex1 :: Functor f => f (Int, Int) -> f Int
  ex1 = map (uncurry (+))

Applies a multi-argument function within a functor. What applicative allows you do is take a product of contexts to a context of products, and lift a value to a context.

  pure :: a -> f a
  zip :: (Applicative f) => (f a, f b) -> f (a, b)

This can then be used to make ex1 into a multi-argument function of contexts, which is not the same as (uncurry (+)) being a multi-argument function

  ex2 :: (Functor f) => (f Int, f Int) -> f Int
  ex2 = ex1 . zip