Artistic/dramatic licence is an excuse if and only if it doesn't "work" without it. I see no problem with making the arrangement of SDs make physical sense; it doesn't detract from the film.
Would you tell Brian de Palma he shouldn't use split focus because it's not realistic and his shots would work without it? Or (spoiler alert) that the whole of Schlinder's List should have been B&W? ;)
DE