Who cares what par is?
Pretty much everyone who plays the game today.
Like it or not, golfers measure their performance against par, and they are just as unhappy making a six or secen a 625-yard hole as they are on a 430-yard hole--provided the card says they are both par fives.
Golfers in my acquaintance are oddly dense about this nuance. They will say things like "This hole is really a par five for me," about a long par four, but if you watch them play, they don't approach the hole that way.
Putting par at four instead of five turns the mental screws just a hair tighter, which is why the USGA does it.
The old story about Payne Stewart and Mike Davis illustrates how it works. Stewart apparently complained that a converted par five had too small a green to accept the second shot as a four. So Davis said he would put it back at five if Stewart could get everyone in the field to promise they'd never attempt to get on in two.
Payne got the point, and apparently told the story to many of his fellow Tour pros.
Players go for the green based on the length of their shot, but they approach it completely different mentally. If it's a par four they feel as if they HAVE to get on for par. If it's a par five, they can accept missing it in two, leaving an easy par opportunity.
All this proves is that golfers are nuts.
K