The idea is that the shows are aimed at a female audience, and this is how they presumably view marriage-- the wives are attractive, composed, able to solve problems while they are married to fat, clueless juveniles. It's a complete reversal of equally unfair 1950s sitcoms with the ditzy airhead wives and sensible husband. Somewhere we went 180 degrees without hitting the middle ground.
I'd like to think a lot of women in the audience would rather watch a partnership between two clever, appealing people. But how often does a show like that ever get on the air? You never know if the audience is only watching what's available or if it's what they prefer.
My favorites of the romantic comedies still remain those breezy, cheerful films of the 1930s and 1940s. Nick and Nora Charles, played by William Powell and Myrna Loy, for example-- they're fun to watch interacting, even when the mystery has been sidelined for the moment.