The more rounds, the more likely the best player wins. Pretty simple concept. If you're trying to determine a world champion, it seems that would be what you would want.
Sure, but there's a point of diminishing returns. I think Steve's point was that, after a certain number of rounds, there is very little change in positions, just winning margin.
Suppose you have results like this, with players A & B being top players and pretty equal:
4 rounds A leads B 1 stroke back Everyone else 8 back
5 rounds B leads A 1 stroke back Everyone else 10 back
6 rounds A leads B 1 stroke back Everyone else 12 back
7 rounds B leads A 1 stroke back Everyone else 14 back
8 rounds A leads B 1 stroke back Everyone else 16 back
So which is the right number of rounds to determine a champion? 4 rounds sort out the best for the rest, and additional rounds just increase that separation. The top players are so close that there's no one right answer as to which is best.
Also consider results where 1 player dominates
4 rounds Player A leads everyone by 8 strokes
5 rounds ...10
6 rounds ...12
7 rounds ...14
8 rounds ...16
So which is the right number of rounds to determine that he's the champion? 4 rounds sort out the best from the rest, additional rounds just increase his margin.
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I'm not saying 4 rounds is the right number. If the only consideration is number of rounds, I'd prefer 6-8. But this is concept that after a certain number of rounds, additional rounds have marginal effect. They may be desirable to greater reward consistent excellence, but aren't necessary to recognize a champion.