The shorter the club, the harder it is to shape a shot. Also, you try to hit mostly straight irons. Generally, great ball strikers limit the amount of curvature in their irons. I am not a great ballstriker, but good enough to have qualified for a June classic with 7 three putts. When in a playing mode, you tend to visualize shots you hit consistently. A long par 3 will cross up the longer hitter if he needs to work the ball. Again, we saw this today with Ernie hitting a weak right and KJ being way short. Of course these could be isolated results, but in this instance, both players spent quite an amount of time trying to figure out the shot selection. Aso, the real bombers do not hit many middle irons on par 4's any more, much less a long iron. Long par 3's bring this challenge back into play