Yes, I agree. More control may sometimes works in the favor of immersion. That's what I liked better about Icewind Dale, in comparison to Baldurs Gate: You had complete control over your group. From start to finish. I think this helps you to identify with all members of the group. They never show any behavior that might not mesh with what you imagine about them. And of course, creating them from the start is a natural way to identify with them, too.
You have complete control over your group in Baldur's Gate as well. The only difference is that they're not blank slates with no backgrounds.