Back before the PGA Tour got their selfish mitts on this course, there was plenty of strategy, mostly due to the nature of the sand in the bunkers. Also, I can cite at least on hole where I learned about strategy, the 15th.
One use to need to drive the ball to the right, so that their second, could find the left side for their approach to this 3 shotter.
Since moving away from Chicago and seeing quality designs elsewhere, the statement that Cog Hill #4 is one of Chicago's bests, may very well be true, but, is a sad reality.