I'd wager to say all media is a result of someone seeing ABC and deciding ADC would be way better. I think anime/manga gets me feeling this way the most. By the virtue of having to color inside the lines of a magazine or network, so many series could be "improved" if they weren't narratively censored. For example, you'll never actually get a deep story about the morality of making pokemon fight, or how the food economy works in that world, because Pokemon simply won't go there. Therefore, the closest you can ever get is someone basically rewriting it as a brand new IP. It's funny, because so many fanfic authors change so much about the original IP, that all they have to do is change some names, and now they have an original work, but to each their own.