Well, twenty years ago, TBS was all about sitcoms that were, at the time, 20-30 years old (many of the ones you mentioned)... twenty years later, in addition to their own shows, TBS still shows sitcoms that are 20-30 years, just ones that are now 20-30 years old, like SEINFELD, EVERYBODY LOVES RAYMOND, F.R.I.E.N.D.S... but now they're also about shows that are still on the air, like THE BIG BANG THEORY (DUH!!!), and pretty much all of Seth MacFarlane's shows.
Back in the day, I think the cartoon aspect of TNT eventually morphed into Cartoon Network when it first came along.
Back in the day, I think the cartoon aspect of TNT eventually morphed into Cartoon Network when it first came along.