Then there’s the fact that this entire arc aims to push Rey to the foreground as the next last Jedi, Luke 2.0, new and improved. However, does she deserve this mantle? Luke goes through hell and back before becoming a Jedi, making mistakes, suffering loss of life and limbs. Rey get’s her powers handed to her, and seemingly is never tempted. She’s almost a perfect heroine. The secret of her parents are supposed to be a representation of her personal demons, but it’s ultimately inconsequential. She cries about it, and the next scene she’s back being the hero. When Luke discovered the secret about his father, there was anguish and reflection, setting up the redemption arc of the next film.
Sorry to jump back a couple of pages, but if you remember Empire, Luke had this huge immediate reaction. The rest of his reaction had nothing to do with who his father is, but that Ben didn’t tell him. His litany is “Ben, why didn’t you tell me.” Before we ever see him really deal with it, he is back to his old self by the end of the movie and back to being a hero in the opening act of Jedi. Yes, he asks Yoda to confirm it, but Luke instantly accepted who his father was and carried on. So I’m failing to see how Rey crying about it and back to being a hero in the next scene is much different.
For one ROTJ takes place about a year after TESB, so it’s a difference between several minutes and a year. Secondly, the Luke we meet in ROTJ is not exactly the same character. He’s more mature, and serious, perhaps even a little darker (applying a Force choke early on). Either way, his discovery of his father’s identity leads directly into him questioning his masters, the shock of the confirmation, and the Vader redemption arc. Rey’s discovery as depicted really can’t go anywhere, and she’s already forgotten about it minutes later in the same film, and it is thus totally inconsequential. So, it’s definitely not the same situation.