I think people's rationale is this: if your skimmer can't process MORE than x gallons per hour why put more than that through a sump when it will just mean more headaches with microbubbles and noise.
I think internal skimmers aren't exactly rated with a flow requirement like external skimmers. Afterall the water is just flowing right by the skimmer and it just pulls from that stream so dirty water certainly does get past it.
I think most people don't want the noise/bubble issues associated with crazy flow thru a sump.
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