Par is helpful so far as keeping score in big events...its easy to see how players are doing.
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Ciao
That's it. And, that could be overcome by an alternative measurement.
If you make two on a hole that requires you to take two shots to reach the green, then you will be excited. You don't need a label of eagle to get you excited. If you tell someone you made a 2 on the hole and they know the hole, they will realize your accomplishment.
If you are 80, and the hole is 250 yards long, your joy should not be diminished by there being an artificial standard of 3 on the card.
If you are 20, and the hole is 500 yards long, your joy should not be increased by there being an artificial standard of 5 on the card.