The underwear I wear is flyless so that's one issue out of the way. And I prefer button-fly jeans so that is the other. So opening the pants is pretty much a habit even if I'm not wearing button-fly.
Also, "through the fly but over the top" can result in physical situations that mildly hamper a smooth flow by crimping on various passageways which can leade to leakage when putting everything away. As the old poem goes, "no matter how much you wiggle and dance, the last drop goes in the pants" which is bad enough without making it worse.
I don't pay enough attention to what other people do to have any idea if methods have changed.
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