Yes. I feel the same way. She came out of nowhere. She had nothing to do with the themes of the story. She was only first mentioned to even exist when the story was 90% done and even then she wasn't introduced as an alien. I've never seen an anime that just pulls out a final antagonist out of hat the way Kishi did with Kaguya. She came completely out of nowhere and her story was left completely open ended and vague.

She was a princess who came to Earth through unknown means. She cared about ending wars on Earth for unexplained reasons. She consumed the fruit, brought peace, became feared as a demon and turned into the juubi. Now Boruto is retconning her origin left and right.

I really didn't like her. She was also extremely bland personality wise. Only ever saying "All chakra is mine". I can't remember her saying anything else unrelated to chakra being hers.

He also does not watch Dragon Ball: Super for the same reason with Beerus, Whis