Just as an example - earlier this year/late last year I got my hands on the Alien RPG. In play, the system is dirt-simple and intuitive. However, spending the 6 or so hours with the rulebook as the GM to learn the game was not fun for me. Some sort of "how to play" video would have helped a whole lot, though as the GM I feel I would have still had to read through the book to ensure I was doing things right.
For someone like my wife, who not just disdains reading but has a learning disability that makes reading tough, reading the rules would not have worked. Having the game demonstrated and explained what/how she could do things in the game was the only feasible way to go. I know a lot of people don't have her specific difficulty, but I've been around enough people to know that sitting down and reading something takes a lot of focus and is often frustrating to a lot of folks (including me, as I get older - I get headaches reading book text anymore). A lot of people are more visually minded, and I think that's why we see so many tutorial videos/podcasts/stream that do so much better at drawing folks in than quick-start rules by seeing the game in action.