https://deadhomersociety.com/zombiesimpsons/ https://deadhomersociety.com/zombiesimpsons/ TL;DR a loss of writers and voice talent from resignations and deaths

https://deadhomersociety.com/zombiesimpsons/ https://deadhomersociety.com/zombiesimpsons/ TL;DR a loss of writers and voice talent from resignations and deaths combined (probably) with the show simply running out of things to say (especially as its irreverent tone took over culture; see also: DFW’s writings on TV) led to its 1) becoming exactly the thing it was originally skewering, 2) relying too much on the “homer gets a new job” gimmick, 3) shifting homer’s Characterization significantly, and not for the better, and 4) spending an awful lot more time subjecting homer to cartoon violence. Decline is foreshadowed in S7, proceeds rapidly from there, and the show’s wholly a shell of itself (a “zombie”) past S12. Site argues its case pretty well, worth a read.