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Jet is Givin yall the real scoop. Dogs taught to sit are more apt to resort to sitting when asked to do something out of their comfort zone. Sit is taught as a puppy,puppies get into everthing,teaching them to sit is a way of keeping them out of undesirable things.generally people lose their cool and get rough when an accident happens so the dog gets thumped on a bit with physical or verbal methods. So further on down the line when the real pressure from training comes along the dog executes the move that means safety. And that is to sit. I've seen dogs sit,lay down,blink,flag and bolt all of those maneuvers are from a rough training style around game. Skip the sit command if your going to take the dog to show for ribbions.
I'm guessing you never had dogs that were completly trained either. Breaking a dog puts pressure on them like Wild says. That pressure can lead to some interesting behavior. Why risk it?
It can lead to sitting on point, but if you do any water cowling with the dog it will need to learn to sit and lay in ground blinds, if you want the full versatility out of your versatile breed.