Since it was made all but official in Strikers, I guess they adjusted even the past a little.
Though the real reason might have been the far more unromantic lack of time. Nanoha and Fate's relationship was the most important focus of this period, everything else needed to give in a little. I'm satisfied they did find some minutes for her mundane friends, though, making her look just as normal a kid as she was (aside from the huge latent potential).