I am inclined to be even more cynical and say their intent is ultimately to release only evil or neutral companions, with just one TOKEN good companion who, because he is high-profile, makes people feel (falsely) like there is balance between the evil and good sides.
Bottom line for me: if my choices are playing with an evil party or playing with a custom party (with no personality or say about anything), then I will do neither and simply not play at all, because both those options are equally intolerable and unacceptable to me.
One of the things I'm most confident about is that Larian will be releasing multiple good companions (or at least, good-leaning). Their stated reason - that they wanted the most feedback on evil companions - definitely makes sense if you look at their evil route. The evil route, which to be fair is probably harder to write than good routes, is fairly shallow atm. So Larian being worried about their evil companions being shallow/too CE is understandable.