Niall:
Why would that be a design flaw?
I have built many holes where you can be better off missing just off the green [in short grass, on the correct side of the hole] than aiming for the middle of the green and missing to the wrong side [having to putt over a big hump]. At Lost Dunes, there are several holes like that on any given day, depending on hole locations. At Crystal Downs [or Augusta, or Merion], there are a few holes where you're better missing just short, than having a "green in regulation" but being above the hole with a steep downhill putt.
For me it's just an attempt to make the golfer redefine what "playing safe" means, and to make him think a little.