I would like to see the devs answering to this one comment, you make a very good point there!
I think what he meant was the NPCs would react to your specific actions and behaviour, making you feel "unique" or "special". They could either be supporting you or very obviously against your very actions.
I've been replaying BG II recently and Aerie comes to mind, she obviously looks up to you very much and yet never panders to you the player. Even if you never pursue a romance with her, it was a good experience.
Welp that's my two cents, anyway