I don’t think I’ve seen any marriage without one spouse being the dominant party. I know one couple in which the wife is the dominant one. They’re fine. I don’t really think about society as a whole when it comes to these matters since the dynamics of modern day relationships are pretty complex. The only opinion I have is that one should pick a partner that complements him/her - character wise, choice of lifestyle etc.
Some men want to be dominated and some women want to dominate. All power to them. I’m a pretty pragmatic person. If I didn’t have the good fortune of meeting my wife earlier in life, I might still be single today. I wouldn’t “settle” for someone who doesn’t suit me.
IME, a 50/50 split doesn’t really work out in the long term. I’ve said this before pretty long ago and I think it was kinda misinterpreted as me saying only the man should be the dominant one: Years later and after hearing more and more of the whining of friends who adopt such a mentality in a relationship (50/50), I’m thinking this is likely due to a constant need for power balance which leads to more conflict.