@Tamerlane I agree with your first paragraph but I feel that Morticia and Gomez’s relationship is quite the healthy one. They treat each other as equals, they’re very loving and doting towards each other, they never put each other down, and they are madly in love with each other (they’re also always trying to get it on lol), and they work together to take care of the kids. The humour comes from their odd tastes in the macabre and being out of place in suburban America.
Contrast this to the sitcoms of the era where the parents in the family are always fighting, at each other throats, and the whole joke is how much they’re trying to one up the other. Those relationships are toxic.