Even as a "close-to-zero".....
For me it's strength required to hit serviceable shots from the rough, and also to hit the ball great distance with control. I once saw Tom Kite hit a regular wedge out of bent-grass rough where I could barely see the ball. Perfect contact, the shot looked normal, and he was a senior tour guy...It makes you realize even more how deep some of that US Open rough is to make these guys chip out.
From 190+, I'm hoping just to hit the fairway or hit the green. I'm not firing at pins with any real skill until I get down to an 8-iron or below.
Also, its the mentality that putts from 10-25 feet are going in. 10 feet is the longest I would be really hoping to make a putt and up to 25 I'm hoping for a good line/roll/stroke (this is their 10 feet). I'm also trying to lag pretty much everything else, and they are always trying to make it.
I can understand the spin, the length (optimization of traj. helps), the contact, the high irons, the bunker-play, the ball working, etc...