I understand it has more overall surface area but, would all that surface area actually be used? I am not sure how to explain what I mean and am thinking. I would think just the cross area would matter not necessarilly the dpeth of the fins.
I am not discrediting what you said, I have no mechanical background and am really just learning this stuff. You could be a mechanical engineer for all I know. It does not make much sense to me how the depth could make for better airflow when you are limited by the area of the filter that is closest to the engine in terms of airflow. I hope that sorta makes sense.
Absolutely it would be used. It's why the manufacture creates all those pleats going up and down rather than one solid straight surface. That increased surface area creates less drag and flows more air.