Where is it ever stated that Sakura/Tsunade's style of fighting revolved around the mechanics of the Sharingan?

Sarada is a main character though. Unoriginal as hell.
Nobody cares that Dai is going to be like Gai and Lee because he is a side character...
Madara had an array of Katon that Itachi nor Sasuke used aswell as Mokuton. Sasuke has Raiton. You can't bar Chidori when Chidori and it's variations are Sasuke's most used technique lol. Atleast their given techniques were slightly different eg. Susanoo, Itachi had sword of totsuke and Sasuke had arrows and wings.
Madara, Itachi and Sasuke were different enough to keep it interesting.
Edit: Sasuke also fought with a sword.