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What difference does it make if the pilot is incapacitated in a plane that flies at 100 vs 200 mph? The outcome is the same.
Point taken but I will point out that many incapacitation events are not the "pilot grabs his chest and does his best Red Foxx impression" sort of instantaneous death resulting in a power dive to the ground sort of occurrence. Many of them are slight (pilot has a coronary but is still able to maintain control) or the pilot flops back in the seat and a passenger winds up at the controls. While such scenarios are rare, it would conceivably be easier for the pilot or non-pilot passenger to handle a slower and lighter aircraft. That's not a valid reason to restrict the operation though in my book.