Tbf, a lot of people misjudged it, including Larian. I don't think a lot of people really believed the "choices and decisions matter" would work as well as it did. Prior to release, I read an article that talked about how it was gonna be neat that the in-game news would update based on your actions. Like, that was the noteworthy function to discuss about the game. "NPCs might talk about your actions in passing to each other".
Did Microsoft underestimate it more than others? Sure. But pretending like every corporation, including Larian, didn't underestimate it a whole lot is a bit crazy.
Edit: and isn't the game Divinity: Original Sin II? Did it have other names in other international markets?
Edit: this was submitted as a response to https://lemmy.world/comment/3615435 but Kbin didn't seem to actually tie them together. It shows me that it was written as a reply on Kbin, but seems to have lost connection to the comment hierarchy.