Thank you!
Also, what you say about new vs. old powers does make sense in other contexts. For example, Naruto uses the rasen-shuriken so much that I forgot what a regular one looks like lol. Same as how Sasuke doesn't use the Chidori variant he learned from Kakashi anymore.
We were introduced to the sharingan thanks to Kakashi's fight against Zabuza, in which he used it to mimic Zabuza's jutsu. Much later, Sasuke used the Sharingan to mimic Lee's taijutsu. But after that, no sharingan users ever really used it to mimic an opponent.
Did Kishi forget about this...