Good thing ArneBab had a different experience, I only tried to explain what "moral lessons" are taught to players in another romance, and why I drew such conclusions about this game.
Since you drew that from Ascended Astarion, I understand that it felt like it went against monogamous relationships: Ascended Astarion ist a plotline where Astarion loses his soul in exchange for power, and that manifests in the relationship.
The game “teaches” many different lessons on morality depending on the Character and decisions you choose.
For Astarion there are early signs of this darker side of the relationship.
Maybe a problem is that humans tend to get attached to a certain character, but that character doesn’t necessarily match their own ideas about life.
There’s no Ascended Astariion marriage of equal partners, just like there’s no polygamous relationship with Lae’zel. You have several “chances” to permanently lose her if you don’t respect her limits.
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That's a great point! Indeed, NPCs regularly talk about their connections just out of the blue, in reality people don't do that, it's really a bit weird.
Some do … and it seems to feel strange to others. Look up "oversharing".