Yes it did. The shows now are blatantly different from the peak 90s period shows which are still funny.
We can make a general measure a person’s maturity easier than a general measure of how a cartoon series changed.
Still, “unwatchability” is measured. Nielsen and others do so. The show continues to have high ratings. Higher than unwatchable.
Nevertheless most mature adults will find that the newer shows of the series are not fun anymore. The dissonance between what the mature adult has come to learn about life contrasted with the show’s silly caricatures, the sophomoric challenges to morality and establishment, are glaring. Whereas older shows — well over a decade old, wear two veils that hide the galling dissonances. One, that one watches them with the remembrance and recollected perceptional framework of one’s bygone but cherished youth. Two, the imaging of morality and social mores is aged, those issues are not of the current moment piquant, many are more settled, the times have moved on.
The fan has matured. The show has not.