Everyone says that it teaches you how to think but I’ve never heard of a good reason why. I remember difficult classes but I don’t remember any special sauce th

Everyone says that it teaches you how to think but I’ve never heard of a good reason why. I remember difficult classes but I don’t remember any special sauce that made me think differently than I did in high school. I’m not saying that I don’t believe that it teaches you this, I just have never heard more reasoning than the surface statement. Does anyone have any examples or theories of this?