I wouldn't say it's stupid so much as variable in its value. Some people are naturally attracted to a wide variety of people, ideas, experiences, and so on. For

I wouldn't say it's stupid so much as variable in its value. Some people are naturally attracted to a wide variety of people, ideas, experiences, and so on. For them, following this advice is likely to turn out well. For others, with narrower horizons, results will be a bit more mixed.