Because it couldnt be good with bad feet, thats why. Those feet that look flatter are what people call Hare feet. They are not flat as in bad pasterns and flat toes like a Bulldog, they are more like the feet of a Wolf. In short they are fantastic big industrial feet. You should care what they look like and understand that everything starts from the ground, and without the ground a dog couldnt propel itself along. Its feet are the first contact with the earth and effect everything that happens when the dog begins to move.
You have probably been spoiled with good feet owning Saluki type do