Actually, I don't get the girls bike/beginner bike thing at all.
The rider makes the bike, not the other way around.
I've seen pretenders on "big" bikes that were obviously rank beginners, and very experienced riders on much smaller machines because that's what they preferred.
The girls ride all kinds of bikes, too.
Ride the bike that suits you and your riding style best. That simple.
For years I've heard that you can't tour on something as small as my old 600VLX, which I thought funny because I was doing exactly that for years.
I take multi-week multi-state motorcycle camping trips every year. I just picked up my C50 last fall and found it a very nice bike to tour on. I never felt I needed more power, etc.. I'm sure my riding style has something to do with it, of course.
In other words, it works for me.
I'm hardly a beginner and anyone who ever saw me would never mistake me for a female.
People would ask how I ride to Sturgis on that little bike. I tell them I get on the highway and follow all the big touring cruisers on trailers.