Women are one-dimensional beings
Women really can't seem to catch a break in TV... or in real life, for that matter. If they weren't nagging their husbands or boyfriends about inconsequential topics, they were pursuing any number of valuable interests, including: fashion, coffee, or assisting an ornery man.
Seriously, it's really hard to put together a list of female characters in sitcoms that weren't waitresses, "working in fashion," or serving as glorified secretaries to any number of charismatic dudes. Roz was Frasier's producer, Elaine worked for J. Peterman in Seinfeld, and Rachel was a waitress and worked at Ralph Lauren in Friends.
And aside from that? It didn't really matter, women didn't have much else going for them in sitcoms of the '90s. They were typically used as a foil for their male counterparts and resorted to talking about their hobbies, which revolved around... yeah, fashion and coffee.