Term coined in 2015? Maybe by Jenny Jaffe at the Vulture.
The progeny of MASH, cynical but sincere shows. Louie, ~BoJack Horseman, Rick and Morty, Broad City.
Not to be confused with Always Sunny, Arrested Development, or Seinfeld, where the characters foibles are their undoing.
Sadcoms have that deficiency and moral bankruptcy, but have more to do with the limits of human understanding and ability, and unjustifiable optimism in the face of it.