Keith,
How is this any different than challenging a bunker or a creek for a preferred angle into the green or an extra distance kick? I think this is one of his main points... its just another hazard on the course
It's a hazard, but perhaps the difference lies in it not having the same distinction in the rules with respect to a penalty drop, assuming you find the ball. You can drop on dry land, perhaps even on a ideal lie with a preferred distance, if you hit into water. You can drop from an unplayable lie in a bunker (within the bunker admittedly.)
With gunch like what I've seen at Erin Hills, you flail away until you get it to shorter grass. I just don't find that compelling golf, whether or not you have spotters.
A shorter height, or less dense rough might represent a greater hazard if it prompts a player to take it on. We've a tiny road-hole/DA bunker on a reachable par five at Warren which is small enough in size to miss, but the consequences of your reaching it help you determine your approach.