Board Thread:Naruto Discussions/@comment-34436445-20180627113230/@comment-26636534-20180627131301

Sharingan, it unlocks potential for genjutsu, taijutsu and ninjutsu without the user having to earn it. Also, the whole, each person who awakens an MS has a special ability is just an excuse for a hax. Or that their chakra and jutsu gets stronger when they feel emotion, all just nonsense.

An honorable mention would be for Kamui in particular. If you die, you can use kamui to come back to the world of the living, posses someone and let them use your abilities. Pure plot no jutsu.