Serious question: What's Rey's arc in this trilogy? I tried contrasting it with Luke's, and I see... nothing. There's no reason for her decisions. Luke's motivated by the murder of his aunt & uncle, and then to save his friends. Rey's motivated by ? to help the Resistance, and then ? to leave Ach-To.
Compare Luke's journey to Rey's so far:
Luke chooses to learn the ways of the Force, because of his family's murder. In ESB, he decides to abandon his training with Yoda, to save his friends even if it means his death.
Rey discovers she can use the Force, because she was captured by Kylo Ren, because she was running around a forest during a battle. In TLJ, she doesn't abandon her training with Luke, because there was no training.
We see Luke progress from barely lifting a rock with the Force, to stacking rocks and having visions of the future. Luke gains self-awareness after his vision in the cave.
Rey learns nothing on Ach-To; in fact, she steals the Jedi texts so she'll end up an even greater Jedi than Luke, with no help from anyone. She gains no self-awareness from the vision in the cave.
Luke decides to confront Vader, believing he's ready to defeat him.
Rey decides to confront Kylo Ren, believing she can turn him.
Luke loses a hand when he fights Vader. He learns he's severely out classed. And he learns his father was not the man he thought he was.
Rey loses nothing in the confrontation with Snoke/Ren, except maybe her hope in Kylo. She learns she's not out classed by Snoke's elite bodyguard, in fact she severely out classes them. She learns her parents were nobodies, but doesn't seem that upset by it.
Luke nearly dies at the hands of Vader, after falling down that shaft. He doesn't save his friends. Han is frozen, and Leia was rescued by Lando. His friends actually save him.
Rey leaves the fight with the guards without a scratch. She saves all her friends by using her amazing Force powers to lift a rock slide out of their way. Nobody's frozen.
Luke is an active character. He has believable motivations. He had to learn to use the Force, he had to put in a lot of effort and chose to pursue it instead of staying with the Rebellion. We see he still has a lot to learn by the end of ESB. We have no idea how he'll defeat Darth Vader.
Rey is being pulled along by the plot. She does not have believable motivations. She's known the Resistance for less than a week, they're hardly friends. She never made the decision to become a Jedi, it was made for her. She never made a choice between learning the Force or helping the Resistance. She didn't need to learn anything about the Force, that knowledge was gifted to her. With the stolen Jedi texts, she'll be as good as any Jedi Master before her, without training from anyone. She does it all on her own, almost by accident. She has nothing left to learn. We already know she'll easily defeat Kylo Ren, and probably the Knights of Ren too.