T^om
Darren nails it. It is an indomitable STRENGTH of the non-USGA handicapping systems that they do NOT "change so infrequently."
Let me ask you. I'd guess that you've been a 4-5 handicap for virtually all of your mature golfing life. Maybe down to 3 or up to 7 form time to time, but never really varying much. Most importanly, I can't really se your game as varying much over the past 25 years. Slice it down the middle, bunt it onto the green, 1-3 putts, 73-81 strokes, thank you very much for the game, where's the GHIN computer?......
But, whiat if, like Darren's Dad, you were collateral damAge in a tragic kiln explosion? Maybe you had to play for a month or two with a Papazian shunt in your left forearm that caused you to hit low hookers rather than high sliders. Maybe you started posting 83,84,85,84,85,85,83,86,84, etc. etc. like somebody we all now "know." Your handicap index goes up to 9.6 before you can say "Bob (Huntley) 's my Uncle (in my dreams....), but you recover, they take the shunt out and you are the same old loveable Huckster yet again. In this case, when you are standing on the 16th at CPC with Shivas and Moriarty and Duran, do you say to them--"Gee, guys, I get a stroke here today, I'm a '12'!", or do you just fade it to the back of the green, as usual, and then go help look for the other players balls?
There is no defence for the USGA handicap system other than naivete or ignorance.