I had the same experience with college. I'd been using Linux for years and learned nothing new about Linux in college. It was nice because the class moved fast and a lot of people who had never Linuxed or CLIed in their lives really struggled to get through it and keep up.
Maybe they missed your point, but plenty of people with expertise go to college in order to get a piece of paper that allows them to work. Making it a middle-class spiritual rite of passage isn't the only way to do college right.
They could've taken other classes then? Lift the lid a bit, learn about computer architecture, VLSI, transistor physics, fabrication, analog devices, MEMS, antenna design. If you already know a lot about computer science, it's unsurprising that you wouldn't learn too many radically new things just computer science classes, but you don't have to do that. Stay curious and seek out things you don't know.
