On the Rey Palpatine reveal:
As much as I enjoyed TFA, the mystery surrounding Rey's lineage was always the least enticing and potentially derailing plot thread going forward. Even at the time, I couldn't help but think that there's simply no way to make for an interesting reveal, just on a dramatic level. Seriously, just forget themes for a second, JJ must have understood there's no way to deliver a satisfying answer to that question, 1) because we've already done the big family twist in the OT - one of the most iconic twists of all time that anything in the ballpark will just feel like blatant rehashing. There's just no need to draw those kinds of comparisons. 2) because between TFA and TLJ, the entire internet would already come up with every possible explanation for who Rey's parents would be, so no answer would actually be surprising in any way. It's a twist without any actual oomph right out the gate. 3) Because it's not a particularly interesting question.
I have my reservations about TLJ, but based on the above issues with the setup, RJ managed to find the only dramatically satisfying answer to that question. Coming up with something that is truly fresh, that truly wasn't prominently and relentlessly discussed online prior, and truly thrust the central character into a place we hadn't seen before in the series is great fucking writing. Star Wars was immediately novel again. What many people misconstrue as a deflection for the question JJ setup is in fact a novel and dramatically charged answer. He thread the needle on what I don't think JJ realised was such an extremely difficult question to answer. Without even really consolidating the thematic work of the reveal, in the cinema at the time, I remember just thinking "of course!" It's such a clear and obvious decision in hindsight. The twist is also, despite endless internet discussion at the time to the contrary, not played for ambiguity. On a literal and technical level, yes, the information is coming from a manipulative Kylo Ren, but it's so clearly designed as concrete sobering story information. This is Rey's reality. She comes from nothing and that's all there is to it.
With all that in mind, the decision in TROS to make Rey a Palpatine is outright baffling, tragic and so disappointing it's fortunate I'm not more invested in these films. It fails to respond to either TLJ or TFA. Unlike the question posed in TFA, TLJ's reveal is not up for debate - it's not a handover for the next writer to decide, even if you didn't like it. It's a decisive statement and the following film should be wrestling with its ramifications. To do anything else just goes against the language of cinema. It's no less shameful than if ROTJ revealed that Vader was lying and manipulating Luke, and that he had indeed murdered Anakin Skywalker. Once the cat's out of the bag, you can't rescind that reveal, especially one that so skillfully landed on one of the only actual novel directions to go with a question like that. And on top of all this, we've still got all the original TFA reasons why this kind of reveal is so ill-fitting: We've already had the big family twist in the OT and, to no one's surprise, this reveal pales in comparison to that one. Why draw comparisons to something so unobtainably iconic? We've already had endless discussion about the potential for Rey to be a Palpatine, so there's just absolutely nothing surprising about something that's so clearly meant to surprise. And finally, it's just not interesting to hear this. Rey is not a more interesting character as a result.
This is all just looking at the dramatic reasons why this kind of thing fails spectacularly. Doesn't even touch on the more tread ground of why it's thematically limp too. Really disappointing.