Well if you mean she sucked the life out of the manga, then I agreeShe was like a birth control pill.
That's true. But Kaguya herself was a disappointment. The same could have been achieved with Madara as the villain.(and it would have been better)To let team 7 fight like old times sake and to make sakura amd kakashi relevant. I think her back story may play a part in this manga still but it was mainly to develop other characters and give the hokages and madara a good send off