I would never attribute a lifestyle choice to a race or subrace. Besides, Halsin is non-monogamous and relationship averse, not polyamorous.

I am poly, and it's actually saddening for people to think that poly entails not seeing the value in relationships, when it is so much the opposite.

And Githyanki are also said to be non-monogamous, yet they choose something different for Lae'zel. I think the game is far too limited in their approaches.

Halsin's romance is the most limiting of all the romances, which really doesn't embrace the polyamorous mentality and values.