I agree with you there on all those parts. I'm genuinely content with the variation they're trying to put into these scenes and I hoping these relationships can take on different forms down the line with the help of our influence. I'm unsure if Larian confirmed anything but just by going off of some of the romances in DOS2, there will most likely be partners where something committed just isn't on the table but I prefer that. It's true to how people work in real life.
I also get what you mean by non-monogamy doesn't mean mature relationships, I just often see those two things go hand in hand. Although, surprisingly enough, I think the most non-monogamous person in the whole party might be Gale. He's still very much in love with someone else, but he also starts caring for you romantically as well if you choose the right options. He's not my type but I'd be lying if I wasn't interested in his romance just for the sake of watching Larian write possible romantic non-monogamy.
They've confirmed that Lae'zel doesn't do monogamy because it's just not a concept to the gith. Astarion seems to have spent the past two centuries seducing victims for his master and when Shadowheart asks if he has anyone special he says something to the effect that Baldur's Gate is "full of sweethearts." So it's clear that commitment hasn't been a thing for him but part of that is likely because of his living arrangement. I'm hoping that, being free, he'll have some relationship flexibility but I can easily see Larian deciding that he's for fun but that's it. Which would be a real shame, imo.
I can definitely see Gale being interesting in that regard. I feel like if he had a facebook profile his relationship status would permanently be set to "it's complicated." I can see it being a struggle for him but he seems like the type who would eventually commit, either way.
