Sarada is training as hard as Naruto here while Boruto is an indolent ninja while still pulling out these new ninjutsu techs. Seems to me that Boruto is the one who should be getting this constant reaction. I mean, he pretty much copied the Gale Palm tech without a Sharingan lol. You mean to tell me someone with a Sharingan shouldn't do better?
Also Sarada has elite ninja as parents. DB says she inherited Sasuke's prodigious talent, as in she got that talent Sasuke was showed us throughout the series, but also Sakura's keen mind and advanced CC. So she can master practically any technique for which she has an affinity. I think after this, there won't be anymore copying. This was to demonstrate Sarada's prowess with the Sharingan. And it's also to fill up the gaps before the Chuunin Exams. Considering she has a solid 4 in Genjutsu by then, this shouldn't startle anyone, but you know how everyone thinks they can dictate facts. Like now people think everything was clarified on the Sharingan just cause it got as much development. Well, truth is we never saw an Uchiha with 1T in action, and we never had an half-blood Uchiha before and Sarada inherited Sakura's traits over inheriting Sasuke's, so I see no reason why the incredulity to the fact she outclassed her father. She clearly has more precocity than he did in his Genin days. CES requires exceptional Chuunin-level CC and Sarada got proficient in it while still an Academy student. Hence why it's believable that she can cast Genjutsu now, cause she meets the prerequisites, and you saw how smart she is. She even realized that the lightning fish Buntan was using were electrolysing the water, and building up hydrogen gas, and used that to her advantage. I mean which Academy student other than Mitsuki would've been able to utilize that info.
Some of these arguments are weak tho, like Kakashi not being able to cast Genjutsu with 2T, at dude that isn't even 1/4 Uchiha, let alone a Genjutsu-type like Sakura.
Just my two cents.

uttahere: