I agree that Haskell in practice is the Cartesian product of all sorts of language extensions. But nevertheless Haskell 98 and Haskell 2010 are, in and of thems

I agree that Haskell in practice is the Cartesian product of all sorts of language extensions. But nevertheless Haskell 98 and Haskell 2010 are, in and of themselves, perfectly productive languages without extensions.