I hear what you're saying here, but here's my thoughts: The dimensions of the shovel is less important as how quickly you're moving snow. This would hold even more true for someone of smaller stature or a woman, but really for anyone. if you can dig longer/harder with a smaller blade vs. tiring out and dragging ass with a larger blade, wouldn't that actually the smarter choice? I wouldn't argue against a burlier model with telescoping handle vs. a thing-walled "lightweight" model that will bend/break more easily.
i agree with your statement but i also maintain that some of the smallest blades out there are simply too small and absolutely some of the shafts/handles... also, having a larger blade doesn't mean that you have to take the biggest scoops all the time - it does give you the option however.