lol. you got me again. yeah, everything's observational humor now, which is amusing, but in a way too easy. back in the day, people had to actually write jokes. they stand up on their own, whereas most "did you ever notice..." type humor depends on the personality of the deliverer. And when that fails, they start throwing in the F bomb as an intensifier to trigger some cheap laughs. Carlin was good at the observational stuff, and I guess Seinfeld, too, but it's overdone. Remember Steven Wright from back in the 80s? I liked him cuz he used actual jokes. He was like a surrealistic Henny Youngman. Anyway, all this is off-topic. So sue me!
Good observations. Continuing the off-topic line, it also used to be true that comics were often self-deprecating and the butt of their own jokes, like Bob Hope or Jack Benny or Rodney Dangerfield. I don't think that happens much anymore.
Seinfeld gives Alan King a lot of credit as an influence on his observational humor, although I think Seinfeld is much funnier than King ever was. I saw Seinfeld playing a small club in LA about 7 or 8 years ago, and he was brilliant, noticeably in his handling of a couple of drunks who tried to become part of his act.
Remember this one? "My parents are in the iron and steel business. My mother irons, and my father steals." Bahd a bing.