Seinfeld's motto guiding the series was "no hugging, no learning". It was set up to be a foil to the sitcoms of the day, which were morally authoritative and each episode was there to teach us a lesson.

There's only one somewhat-serious moment in the entire series, and it's when Jerry tells Elaine he doesn't want to get back together.

It's really brilliant and stands the test of time so well. But yes, definitely nihilistic.