I've always felt that the idea of par is more important than the mathematics of par. The game is scored by adding up the points scored. Par just tells you about how difficult this hole is going to be. Here's how that sounds:
"Holy cow, Jeff! What a fantastic round by Chuck McFlatsnaps! He put up an amazing 68 to take the win here at Anhyzer Bush DGC memorial!"
"You got that right, Sally! He snatched victory from "Flicks" Treelove by 4 strokes! Just amazing stuff! Amazing stuff."
"Now you know that the Anhyzer Bush course is rated par 72, Jeff, which makes McFlatsnaps win all the more impressive!"
"Yes it does, Sally, yes it does."
It's the score that matters. Regardless.
And 9 holes are fine, but if not 9 then no less than 18. But I have no problem with additional holes. I think additional holes should come in either 4, 5 or 9 hole sizes. 4 is square, five is one hand, and 9 is (see above comment)