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Well you are disregarding the entire concept of an oil filter. The whole point is that it can have bigger "holes" in the filter but the oil itself acts as a filter to "stick" to particals. So instead of a mechanical filter if you will, its a oil film filter that lets air through but sticks the dirt and particals.
So yes you can have bigger flow with not much more dirt go through due to the oil. That is why putting an oiled filter back in under oiled is devestating
I have 5 new BMC fitlers i replace every 10k miles as I don't like to clean and reoil mine.
The non-oiled filters obviously flow less as stated
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