biases and cultural norms to overcome

Some of these exist for good reasons. Among other issues, polyamory gives high-status men an excuse to tell low-status men that their feelings of discomfort are "biases and cultural norms to overcome".

I'd say it's just like monogamous sex: it's best not to (if you're trying to maximize productivity), but if you're going to do it anyway you might as well do it in a well-thought-out happiness-increasing way.