Why did Boy Meets Wrold turn into a drama soap oprah like one life to live in season 5 and 6, season 6 went back to being goofy in season 7 ???

https://www.youtube.com/watch?v=n3eJkf4erbI
https://www.youtube.com/watch?v=n3eJkf4erbI
https://www.youtube.com/watch?v=n3eJkf4erbI