At Shadow Creek in Vegas, Fazio spec'd out a reduced height flagstick on the 11th, continually diminished the size of the bunkers down the hole, and also reduced green size to create a "forced perspective" on the hole. It is VERY effective at making the approach shot appear longer.
I suspect that most golfers would say it is "unfair" as I have heard complaints about the little ball top/middle/bottom to distinguish pin position being slightly off being unfair. I further suspect that if you varied the pins every day, one day with extra short, then standard, then extra long, they would really go nuts!
It will mess with your perspective, but is that a good technique, or is it not?