Well, making a good superhero movie is harder than people think. At the end of the day, studios are risk adverse, and making a woman focused superhero movie is seen as riskier as it is more niche, which means they are more prone to interventions and design by committee, so it is a self perpetuating problem.
Speaking of which, Lemmy plug "Birds of Prey" (also starring some crazy clown woman) here today, in my humble and totally unbiased opinion, it's a pretty fun superhero movie that more people should watch.