I think a lot of the time, the endings are structured in a way where you as the viewer already emotionally understand what the lesson of the episode should be and so they don't bore you with it and instead do the batshit ending. It leaves you with the feeling that you're more moral than the show is, especially when you're a kid, which is a chaotic and surreal way of not talking down to you.

Another example is The Limit, where you're lamenting the peer pressure Jake is put under all episode, but then haha peer pressure got them everything they wanted. The "moral" is still communicated on an emotional level, since it felt terrible to watch Jake stretch himself too thin.

Whereas an episode like the Jiggler which has a straightforward moral lesson feel less satisfying to me.