system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do japanese cartoons change their opening/ending so often (10-20 episodes) compared to western cartoons, that keep the same opening for many seasons (south park, the Simpsons, family guy)?
gpt
Funny you should mention South park.  Although they keep the song, they change the scenes from season to season.  Also the Simpsons, which has a different couch scene, billboard, and chalkboard every episode.  The walking dead changes openings every season, sorta, because of the ... character changes.

It all comes down to how often their story/content changes.  No sense showing kid naruto for 300 episodes, playing with sasuke and struggling against common thugs when it doesn't make sense anymore.  They also do a lot of tie-ins with the music.