Watch ball golf. That'll explain the how and why. It's gimmicky to have all par 3's IMO.
Par is defined as: the number of strokes a first-class player should normally require for a particular hole or course.
Match the score to a number that is reasonable for first class players. Another train of thought is "if you can't ace it, it should probably be a par 4+".
If numbers don't matter to you, do you not get excited when you ace a hole? It's just a number after all. Or do you care when you go on a streak and get a bunch of birdie 2's? What happens when you have the mentality that you want to birdie every hole (high level competitors have this mindset, right?) and they step up to a par 3 700' hole?
Only problem is that we don't play BALL GOLF. You lay up to save that par buddy, when erry one else on the card is going for a three and you are turning in 800 rounds you'll see the folly of your ways.
Happy new year!