I can't agree with the article tho. I still see that same grasping in current shows like Better Call Saul, Shameless (which, aside from Season 2, is fantastic), and, in a different way, The Big Bang Theory and Silicon Valley.
Most comedies are just joke delivery mediums with paper thin walls. But nothing has changed, shows have always been a reflection of their creators/runners and the networks fund people who've had hits.. Family Guy was a hit on DVD/[adult swim]? Ok! Order two more joke delivery vehicles from Seth MacFarlane!
James L. Brooks had a string of hits with a strong emotional core. So after he helped get The Simpsons on the air it made sense that he essentially forced the 20-something writers to build the show around an emotional/sentimental core instead of letting it to devolve into a gag factory out of the gate.