The thread proposes a hypothetical of Sarada copying Lee's taijutsu the way Sasuke did. Sarada is the same age as Sasuke was, and has already completed 8 missions and participated in the Chunin Exams and she's still with one tomoe.You say it like she'll have a single tomoe forever. I'm pretty sure she will have 3 or even MS in the timeskip.
She's growing slow.