Agreed. But if the Air was more powerful, could it use the same form factor? A more powerful CPU means more power consumption, with need a bigger battery. Also, more excess heat to dissipate which means a fan system. Start adding these things on and pretty soon you have a MacBook Pro.
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Spinal issues, multiple shoulder dislocations, and knee injuries (due to motorcross, long distance running, etc.) means I have to be very careful weight lifting. No military presses or anything that compresses spine. Bench, curls, core, planking, etc. are about it. Still run 3-4 miles a day because of running addiction even though back shows degeneration on MRI. Never lift anything heavy especially in a shoulder bag that pulls one way or not the other.