lmao, boruto seal didn't just pop up off screen though, you can't compare that, plus boruto has been trainjng with sasuke so him coming up with new lightning and wind jutsu snd some water is reasonable. Plus his genes is mixed with hyuuga and uzamaki what do you expect.
lmao thats off screen training though, this is diffrent you can't simply off screen train for a 3t sharigan. Sasuke trained all the time but it took him life and death situations and fighting his best friend to unlocked 3t and he was a full bread 100% uchiha, plus a incarnate . Sarada on the other hand has only had one serious with butan, and we all know she was fodder comapred to shizuma.
ps: sarada faints for using 1t, what logical sense does it make to give her 3t