You know, some women like a little extra pink and purple and "girly stuff". Others reject that notion and want to pound it out with the guys.
It may actually be a unique marketing niche to have dimensions and seats suited for women, but otherwise, a bike that looks just like the others.
If many women are more flexible than men, why do women get the step-through frames? Yes, skirts... but that may not be needed for many women.
That looks like a road bike, but for Diamondback, I'd think that rugged looking women's cross and MTBs might sell well.