Larian now has NO WAY OF COLLECTING RELIABLE DATA in EA concerning player preferences.
If Swen never asked people to play evil and EA showed that very few people did then they could make better decisions on where to focus resources. At this point they can show data that justifies more evil options, but only because they've skewed the results.
What makes you think Larian cares about player preferences in regards to including a variety morally distinct options? How often people choose evil over good isn’t impacting their choice to include evil options. They already know most players want to be good.