All-way stop v roundabout

Thanks to Sam Goater for sending this entertaining clip from the U.S. show Mythbusters. I’ve always thought the all-way stop should be an all-way yield, because what’s the point of stopping if you can continue filtering? In the experiment, it wasn’t clear if drivers were all stopping (as the dumb law requires), or if, when they could, they kept going. Would it have made any difference to the count? Of course the all-way stop is more efficient in terms of road space required, as a roundabout needs a bigger footprint. They also do a comparison with an “officer” directing traffic, akin to traffic signal control.