Ugh, I really don't like what this anime has done with the Sharingan and the discussions about it just make it worse. While seeing fast movement and chakra are a given, Sarada's been able to copy multiple ninjutsu and cast genjutsu with just one tomoe which doesn't work for me.
If it was like the Byakugan, then sure, since that has all of the abilities from the start and just gets better with time. But we know that the Sharingan unlocks new abilities at each stage instead. What's the point of the tomoe evolution if you can have everything from the start? Might as well have have 3T Sharingan the default.
The wiki, for some reason, says that "All the Sharingan's abilities are available to the user from its earliest stage, but with greater development comes greater proficiency with those abilities" and cites
this scene which basically shows the exact opposite as Sasuke gets new ability.
All my sighs.