Board Thread:Theories and Speculation/@comment-1930928-20191128005957/@comment-35409024-20200203070003

Same reason why Sharingan users still can get caught in Genjutsu. And if they were alive, the Uchiha would of been right there with the Hyuga when it came to Infinite Tsukuyomi. Sharingan allows the user to detect Genjutsu, and let's them "see through" it. But time and time again throughout the series, Genjutsu has been used on Sharingan users. They still experienced the illusions, but they knew they were Genjutsu. Same would happen to an Hyuga. They would know about the Genjutsu, but they'd experience it. Just because you know you're in Genjutsu, doesn't mean you can break free.