How long did it take you to figure out that there were people out there stronger than Kaguya? I ask this because it took Team 7 over a decade to realize that compared to many people coming to the same conclusion right after they read the chapter(including myself).
Welp, you came to the wrong conclusion then, since Momo/Kin are not stronger, just a threat to her Shinju. Just as how Nagato called Kakashi a threat to Akatsuki and their plans... doesn't actually mean that he could waltz up to them and go on a solo spree.
The manga wasn't even finished. It took two movies to finish it. That's some next level shit-tier writing.
I'd like to see you try and write a complete arc plus a highly anticipated final battle in less than 20 chapters because
your publisher tells you to wrap things up
after you've started an arc. All things considered, Kishi did pretty well considering the constraints he had.
Besides, the movies weren't to finish it... TL was about Hamura's descendants where the main story wasn't. It was just an expansion of the story, and wrote before the manga had even finished. Boruto was yet another expansion, whilst filling in some gaps about Kaguya's reasoning.