Throwing this here because Okay, I have to.
Snoke’s death mirrors the Emporers.
The Force/Psychic/Astral Projection plot isn’t exactly original either.
The Hero’s parents not being anyone special is actually really common. Case in point being Anakin, with the obvious exception of “miraculous conception” which doesn’t make his mom special, just him.
The Wise mentor being disillusioned is a freaking TROPE. I mean, come on, how many stories have the hero passing a test and impressing the mentor before they’ll teach him or her because “The last student I taught turned evil and abused my teachings, forcing me to run away and hide forever.”
Protagonists are ALWAYS breaking the rules and disobeying orders/mutinying against their superiors when they believe that their superior is leading them the wrong way. That’s also a trope.
Like, not to say TLJ was a terrible movie, but to say that any of its ideas were “pretty original” is like saying that The Room is a thinker’s movie.