The key insight is that all languages have monads, but very few have monad. It’s up to the programmer to see the pattern in e.g. Javascript. But other than having higher kinds there’s not much that keeps most languages from having them the same way e.g. Haskell has.

The »plain monad« part was directed at Javascript, not Haskell. Haskell, like JS, can work perfectly fine without monads, but it still works perfectly fine with them ;-)