For the most part people would agree we design our tanks and water flow to keep things suspended and be as efficient as possible at forcing debris and other crap to the overflow so it can filtered out before settling and breaking down in the display.
So with that said it's clear why one might want to consider turning off or at least reducing the flow during feeding times. If you don't you'll likely waste a good portion of food that will get filtered out and depending on what goes on from there the extra food may not be filtered out properly and break down into nutrients.
In addition some peoples livestock might benefit from not having to chase down food at light speed but this depends on what livestock you keep.
If you feel neither of these are issues with your tank then yeah it wouldn't make much sense to shut off pumps.
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