Because our interests don't perfectly align with what they want us to learn. My main special interest when I was 20 or so what audio technology, I was lucky enough to get to go to an audio engineering trade school and for the first time ever, in my entire life I became a 4.0 GPA student. Meanwhile, the class of 12 that started with me dropped to a class of 6 within weeks and I saw multiple other students struggling and failing at the same exact classes. The same person who was barely passing most classes in high school was now helping formerly 4.0 GPA students with THEIR homework.
Fast forward to today and now I'm struggling to find work. The world is not designed for the smart to be successful, it's designed to turn the hard working into servants and the rest of us into examples.

