Best way to advance is to play same course to drive down scores through familiarity and repetition.
Yup, if the goal is simply to advance, then that's the way to do it. And when I first started playing the game, that's what I did. What that means is I avoided the harder courses in order to get a lower average.
And as a number of people above me have already noted, that was exactly the wrong approach. So once I got to legend and decided that I was bored with St. Andrews, I wanted to play other courses. It was only then I found out that I had no idea how to play them.
A year later, I'm still trying to figure out the other courses. But I discovered the game is a lot more fun and interesting if you're not playing the same 9 holes over and over... and over.