I disagree.I loved loved loved Seven, but did anyone else miss Janeway's relationship with B'Ellana once Seven came along? Actually now that I think about it, I just missed B'Ellana in general.
Yes, I did.
In fact, B'Elanna became superfluous in the later seasons which was a shame.
While Torres didn't have the same focus on her that Seven did, I still found Be'Lanna eps. had just as much emotional impact as Seven's did. Due to Roxanne's great acting skills and the wonderful stories they gave her, I felt like I knew the character like the back of my hand by the end of the series and in ways better than Seven. Sorry, I don't find Roxanne/Be'Lanna superfluous. She was worth every dime and I cherished every moment she was on the screen.