You are correct that there is no "throwing the receiver open" on a certain percentage of throws. The QB works his progression or bails out of the pocket, a receiver breaks and gets separation, the QB sees him and throws him the ball. Or the QB throws a check-down to a guy sitting down in a zone seam. Simple.
Then there are all of the other throws.
Certainly receivers need to be able to adjust to a ball that may be thrown to a place where they may not have expected it to be. To think those throws are accidental would be correct in some cases; to think they are accidental in all cases is a mistake.
As for jocks being jocks, you may be of the mistaken opinion that "instinctual" play is innate and not the product of practice, learned behaviors and design. Your reading assignment, should you choose to accept it, is Malcolm Gladwell's "Blink: The Power of Thinking Without Thinking".
Your contention that "no QB has the ability to place a ball exactly how he or the receiver wants it beyond a 10 yd. throw" is true if you mean "every time", but it's a game of percentages making your assertion clearly an exaggeration, and the extent to which your assertion is true argues for the importance of "throwing the receiver open" as much as against it.
Then there's the question, "what is accuracy?" Is it the ability to put the ball where the receiver can catch it? Surely. However accuracy is as much about putting the ball where the defender cannot. The consideration of completion percentage together with interception rate goes largely to the ability to "throw a receiver open".
There are subtleties involved in the process that, when accumulated, differentiate poor-to-mediocre play from outstanding play.
