So you are claiming that if Raistlin hadn't have had a 10 Con, but a 16 Con, and had been turned over to the writers with a physical description like, "He has a wiry athletic physique." rather than, "He has a slight build.", that we would have ended up with the same character?
I notice that no one has taken the OP up on his offer, so I think he's made his point.
The easy way to rebuff the challenge is to propose a more fair counter challenge. "If the DM allowed you to take all 18's, would you do it?"
I wouldn't. I'd choose at least one attribute that was relatively weak because my character is more interesting that way. And I suspect that I'm not alone in that regard.