Yeah that’s a good point. Almost everyone watches TV. But people like say Jimmy Kimmel watched TV so closely that they came to understand its underlying mechanisms.
What makes people laugh? What entertains them and makes them less lonely? Who are the important people in the business? You could watch TV for years and never ask yourself those questions.
After all there’s no real school for TV. Many people on TV now studied it by simply paying closer attention. There are LA insiders for sure who can watch their parents, but there are also people like Letterman who was from a small town in Indiana.
As another example, a lot of UFC fighters also grew up watching the nascent sport in the 90’s. They learned how it worked simply by paying more attention, practicing, and being more obsessive about it than the millions of other fans. There’s no school for it since it was a rapidly developing martial art. YouTube has apparently permanently changed the state of practice in Jiu-Jitsu.