True, but what if you turn to face your neighbor to converse or look?
I don't think a casual turn of the head is going to matter much.
I told my neighbor that I remember the days of flying when there were smoking sections in the back of the plane. I used to turn the blower on high and point it behind me to make a wall of air to keep the smoke away. I suppose people can do that today, too, to put an air buffer between the rows.
-PJ