This boils down to an "is Pluto a planet" debate.

We act as if some languages have "compound words" that can encompass entire sentences (subject & object attaching to the verb as prefixes or suffixes) while others don't form compounds, and most are somewhere in between. But these are all statements about lexicographic conventions and say nothing about the languages. In reality all languages are muddles sprawling across a multidimensional continuum, and they abso-frigging-lutely do n't sit neatly in such pigeonholes.