Season 1s are great, setup, some payoff, a bit of lead into the overarching story. Then season 2 to X. The heroes win and then lose in the final episode, cliffhanger to next season. People get bored. Final season is announced and they wrap up the show.
I don’t agree with the example of Kelso. In the latter seasons he goes from being a horrible human to a somewhat empathetic and cool sage. I love it
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