People really on others teeth these days. Using fallacious after fallacious logic. Mirai is a prodigy, no wonder, since she is the daughter of the strongest genjutsu user in leaf. Which would mean mirai has more potential or at least equal to her. Sarada just has one tomoe so give her some time, I'm sure she'll wreck the hyuga's byakugan and put them in a genjutsu with two tomoe. Maybe even defeat mirai completely with three tomoe.
Edit : Tenseigan is an otsutsuki eye first used by hamura, a combination of both pure byakugan and hamura's chakra, why compare such a thing to a solo un'merged sharingan which still in one tomoe state copied high level sword jutsu and completely trapped a jounin in it? Lmao.