There's a very interesting YouTube video that has a bit more of an explanation on why The Simpsons had a decline. I liked how they analyze the show and IMO it does a great job explaining why lots of people loved the show up until season 9-10. Personally I think I enjoyed up to season 12 or so, but definitely after 10 I noticed the shift in style/quality/whathaveyou. Could never put it into words why it felt like that…
Just watched this, thanks. My summary: 1) Staff turnover roughly around season 8 caused the writing to change. Jokes got simpler, not as much about the characters' invariants (for lack of a better term). 2) The show was originally successful because it parodied the sitcom era of the mid 1980s. That changed so the context disappeared.
They weren't just one liners but instead would build up gradually.
That's what I like about this analysis, it got me to understand something that I somehow felt but had no idea that it was actually happening.