The Byakugan's all-seeing capabilities presented several oppurtunities where it could have been used effectievly but was completely ignored by Kishimoto simply for the sake of plot. We know that the Byakugan can see the difference between every person's charkra colors, as shown with Ao noticing Shisui's chakra flowing through Danzo. Yet, when Hinata ran into Obito during the Itachi Pursuit Saga, where she had her Byakugan active, she somehow missed Obito's Sharingan and Kakashi's Sharingan releasing the same chakra. Simply to avoid Obito's identity being revealed so easily, one of the Byakugan's abilities was ignored.
Another example of this would be with Kaguya. The Byakugan has a vision of 50 M at its most basic, which can be extended multiple times over should the user choose to do so, with Hinata being able to see as far as 20 KM. Naturally, this would mean Kaguya should have no problem seeing around her. Yet, she missed a massive Susano'O and Sakura being behind her, leading to her being punched and sealed away. The argument that Sakura somehow slipped into the Byakugan's blindspot makes no sense as, one, that fact is secret to the Hyuga alone, and two, the blind spot is far too narrow for a human to hide behind, as shown with Kidomaru only ever being able to barely hit Neji with his daggers. Simply to shoehorn Sakura into a Team 7 moment, one of the Byakugan's abilitiies was ignored.
Another instance of Kaguya's Byakugan not being used simply to aid her insect-like opponents win the battle is when Obito and Sakura snuck into the Core Dimension along with Naruto's clone. And how did they veil their presence form Kaguya? By hiding behind a hill. And all it would have taken was for her to activate her Byakugan to see them their and prevent them from saving Sasuke.
Another instance of Kaguya's Byakugan being ignored is when she fell for Naruto's transformation feint, where he transformed into Sasuke in order to trick Kaguya, which is what ultimately lead to her being sealed again. This makes no sense since the Byakugan can easily tell the difference between people's chakras, and even if Kaguya was unfamiliar with Naruto and Sasuke's chakras, this would be irrelevant, as not only would she still be able to see they're diffrent, she would also be able to see the Sun and Moon seals on their hands regardless of any transformation.
Finally, there's Momoshiki, who is in a similar boat to Kaguya. See, its more than apparent that both Kaguya and Momoshiki are massively powerful opponents, far powerful than both Naruto and Sasuke on one on one's, if not so powerful that defeating them was far too unrealstic for Kishimoto to implement without bending the rules. After all, you have a powerful opponent with an all seeing eye who can absorb chakra, so neither brute force nor sneak attacks can work on ither Kaguya or Momoshiki. This is why both of them were defeated in such painstakingly awful ways. With Momoshiki, the explanation given is that Bolt was able to hit Momoshiki with his invisible Rasengan, which makes no sense, as, just like Kaguya, his Byakugan, and even his three Rennigans, should have been able to see the chakra there, even if the Rasengan wasn't visibly still there. Simply due to shoehorn Bolt into a fight way too big for him, one of the Byakugan's abilities was ignored.
Momoshiki's Byakugan's ability is also ignored when his opponents, much like Kaguya, are able to trick him with transformation techniques and clones, which makes zero sense, in order to act as decoys allowing Bolt to get in close to hit Momoshiki with his Rasengan,