I think it might be more interesting if they'd cut it at fringe height all around the greens, encompassing the bunker surrounds. I saw a lot of balls get hung up in the rough that should have continued on down into the bunkers -- and some of these bunkers were actually penal depending on the pin position, which is refreshing to see on any US course.
Basically the way I'd like to see it planned is that if a ball rolled off the green with a small amount of speed, as might happen if it was putted off the green, it would collect into some fringe height grass. But if it had more speed it could get through the fringe height grass directly into the gnarly stuff. The real tall, honest to goodness rough. None of these ridiculous seven levels of hell -- there's a purpose for that on fairways to penalize wildly misdirected tee shots, but not around the greens.
What I'd envision would mean that a shot that was hit from the fairway and perhaps missed a bit or hit too strongly so that it hit on the green but couldn't hold would stay in the short grass around the green. It would be possible to putt, chip, pitch, etc. Like what they did behind the 3rd green. But if you hit a shot from the rough where it wasn't under much control you'd likely carry enough speed on the ball it would get into the thick juicy rough.
This would further reinforce the reward for hitting fairways, and maybe help discriminate between drives hit in the fairway and balls hit into that puny little 1.5" first cut. If you could control the ball reasonably well into the green you'd be in the short grass and have more options for playing your next shot, if you couldn't control it and ended up in the spinach, your options would be dimished down to one as penalty for your sins.
I really hated seeing guys putting off the green and ending up in some fairly thick rough where it wasn't even possible to use putter on the next stroke. I think that was taking things a bit too far.