Sorry man, this just shows a lack of understanding of the game. The benefit of zone is that it stops penetration and allows you to collapse down on someone near the basket. This doesnt magically change once you get to the NBA level. The reason it isn't utilized is because the NBA doesn't want defense being played, so they conjured up the defensive 3 second rule.
And saying that illegal defense is allowed elsewhere is a very backwards perspective. First of all, as far as I know the 400 or so players on NBA rosters are the only people in the world who play under such a rule. In the sport of basketball, there is no such thing as limitations to where a defender can station himself on the court. In fact, almost no sports in general have a rule like this.