I bought a WSD ("Women specify design") bicycle for my wife which was delivered in a box.
After putting it together I took it for a ride to test it and I realised two things.
The seat tube is shorter, I don't think that an angled top tube should have anything to do with it. Saddle height is important so running out of seat post is more likely with a shorter seat tube and I don't think that is a good thing, also a seat post is more likely to flex more than a seat tube.
Another observation is that the crank length are shorter, which also means that you may have to adjust the saddle further back to make sure you can apply all your leg power when the crank hits the lowest point and starts to rise.
I also thought that a women's legs, proportionally, have longer thighs and shorter legs from knee to foot, which also suggest that the saddle should be further back.
Should WSD bike frames have longer seat tubes? Should the seat tube have a shallower angle to makeup for saddle position over the crank set?