So here’s the thing. Non-monogamy is not more enlightened, but I accept that it may have been their gateway to breaking toxic patterns or behaviors in people’s personal circle.
Having more than one partner is not the epitome of freedom because every day, we see non-monogamous and polyamorous people still with their insecurities affecting their ability to communicate. Some also struggle to come to terms with what they want because they aren’t comfortable with those things; Some can’t be honest with their partners about those things because they still have shame and fight their social conditioning.
I find the idea that non-monogamy of any type, expressly polyamory, giving us some superiority (emotionally, socially, and psychologically) to be so ridiculous because plenty of monogamists that study sexuality, psychology, and social engagement show us how to be free, healthy, and comfortable in ourselves.
Now I don’t necessarily believe our species is monoamrous or polyamorous by nature. Many people interpret monogamy and polyamory as a human evolutionary leap rather than part of social evolution. We are not a species that can interact in ways that limit our social capacity.
Mating is reproductive. What we call relationships now are social. Many relationships in the past are based on mating but socially controlled by groups wanting to retain power over others. But that is not the end of our ability to find companionship and interact with others.
Polyamorists are not inventing anything new technically. We are just humans trying to get back to what we need to be healthy. This is one of our modern equivalent and interpretation. There are many other ways of engaging our healthy social and relational needs.
Grumbles with Kitten In Limbo 