Ya know these topics are interesting because it gets pretty existential pretty quickly. What do you think you are? What do you think our purpose is here?
Personally I see us as souls temporarily inhabiting human bodies. I am not a woman, I am a soul existing here very temporarily in a female body.
I find a part of the purpose of life (guessing here as claiming to know the purpose of life is wild hubris) to be personal development and individuation. Having a sub/dom relationship holds both parties back from taking on full responsibility for their life and in letting go of trying to control others. I see these arrangements as contrary to development and contrary to the purpose of life itself.