You’re not going to convince me that a profile shot of the presenter’s face makes any sense in a context of that presenter addressing the lens in the main shot. If you are having an eye to eye “first person” conversation with the lens, the lens standing in for the audience, a sudden side profile cut-away of your head looking 45 degrees off the lens, though the same conversation is still taking place, makes no sense to me and I don’t think it ever will.
It’s an attempt at an affectation, like the one used so much in soap operas, where a person in a 2-person conversation turns away from the other person and keeps talking, but they’ve turned 180 degrees to face the camera, usually in extreme closeup and close foreground, maybe with the other actor in the frame over the shoulder, in deep background.




It’s an artificial construct from stage acting.
Nobody really holds conversations like that, not for more than a few seconds, anyway, in real life. If I talked to you face to face and suddenly did a 180 turn on my heel and held most of the rest of the discussion facing directly away from you, you would think there was something wrong with me.
The point of the soap opera 2-shot is to communicate some interior emotional information in the facing actor, usually their attempt to hide a deep dark secret or disguise an emotion that would give them away.
None of that artifice applies in the presenter shot you’re talking about, when that presenter is addressing the camera.
It is “okay” to use that shot when your camera is an omniscient 3rd person view…


Because the lens is not the entity being addressed. It’s witnessing but not involved.