I never cared for such systems or any other sort of information regarding someone's opinion on where the hole is relation to the dimensions of the putting green/angle of play. Especially as hole corridors get wider, this information becomes increasingly irrelevant. You'll see this when irrigation heads are marked with distances to the (front/middle/back) of each green. As you get to the edges of the hole, the numbers compress and the information becomes less useful since those yardages are determined from the center line of play - usually from some arbitrary distance like 150 yards.
Show me the target and I'll read the ground from there.
P.S. If you understand a little bit about Military Crests, the striped flag-sticks can be very helpful in helping you determine the location of the flag-stick in relation to little crests, ridges, and bumps along the ground.
P.P.S. I once asked the question on here about how the approach shot would be perceived if all information regarding hole location were known to the golfer without flags in the holes. When you have to use the features of the golf course to orient yourself without flag sticks, you tend to notice things more.