Sasukes sharigan is just part of his fighting style. Most of his fights are with high level people why wouldn't he use it? Naruto abuses the same techniques because he has high chakra why cant Sasuke use his bloodline sharigan to compensate? Like I said Sasuke still trained his ass off remember that 7 year gap of training?
What did Sasuke learn:
Advanced Chidori techniques that went far beyond than what Kakashi ever did
Became skillfull and master of a sword
Became a master of his own power I.E (orichumarus curse seal and powers)
Naruto: A bigger Rasengan
I know there was much more but couldn't think of any. Naruto learning how to use weapons was good but he has yet to use it in a real fight. PS: he defeated a weakened Kakuza
I want to hurt you badly.
Naruto learned how to fully control the 2nd tail.
Learned to counter simple genjutsu.
Learned how to better use his techniques.
Got faster.
Not so stupid anymore.
and it was a 2 year period.
Sasuke got faster (Shun-shin)
Advanced chidori techniques.
Snakes.
Still power hungry.
Imo, a sharingan user trains more efficiently and faster.
Giving them a huge timeskip ahead of the rest.
Look at naruto now.
He thinks , and uses different combinations of rasengans to completely annihlate edo tensei's.
What does sasuke do.
Amaterasu, Susano'o.
That is all he did against raikage.
Only one chidori.