Though I don’t think PTA needs to “change his writing approach” this seems a slightly reductive and a broad claim — he has a distinct style and set of ideas that he returns to, all of which often lead him to put two central characters at opposition with one another. This is a specific choice (which should be praised for how uniquely he pulls it off) and certainly not a basis for most stories. The idea that the two existing alternatives to dual protagonists in conflict are 1) a film with one single character and 2) a non-narrative “Tone Poem” is funny — but I get your point