There is a difference between dialogue you aren't supposed to understand (Nolan) and dialogue you should understand but can't (basically everyone else)

Have you seen Tenet? Almost the entire movie is impossible to understand, and it's a film that depends heavily on exposition.

By making the exposition unintelligible, I guess he's illustrating how complicated time travel makes a story.

Except Primer did that without this crutch.

Yeah... At home we have partially solved this problem by using a BT speaker on the table, as we mostly watch movie while we have dinner. Simple and effective.