Eh, I don't discount that some experiences are like that, but not all. If you grow up in a suburban town like any of 50 around me, it's an experience to encounter someone from... Turkey for example, or from Texas, or California, or Minnesota.
I often used music with my kids; when you're in high school, especially a public one, you know all those kids for years. It's like having 10 CDs, with 10 songs each, and you listen to them over and over. And you don't have other CDs, so maybe you listen to the songs you like MOST, but maybe don't LOVE. Then you go to college, and you have 1000 CDS with 10 songs each, and you can experience other genres, other artists, other songs, and you start to see that maybe you like other things. And you start to listen to songs you really like as opposed to like more than the rest. (Then, of course, you graduate into the real world and it's Spotify/Apple Music, where any song of any genre by any artist is available to you.)
I also learned that people think differently - sometimes radically so - and people have different values - sometimes radically so. You learn to interact and navigate with people that don't have 15 years of history with you. Who take you at face value - or not. You get a great perspective in how you and your ideas are perceived. You learn that maybe you can drive that narrative a bit. Maybe someone else doesn't have that experience, and that's fine, I respect it, but we've all had 15 years, plus minus of primary school, we're all going to work 40, 50 years after, why not have that other experience? My best and closest friends are those I made in college. Ride or die friends.