There is plenty of slope in the green, so holding a longer shot is not much of an issue. It would make shots to the upper plateau that much tougher, but those guys can handle it.
I have no idea exactly why it was shortened and whether it's about infrastructure and crowd control issues that overrule the shot values.
However, I will say that the knee-jerk reaction of "when in doubt, lengthen," is not the direction we need to keep going. One of my favorite quotes on design was from Dr. MacKenzie, which I'll have to paraphrase a bit: "If you have a bad hole, don't lengthen it; shorten it and get it out of the way."