Yoda does say, “Lost Ben Solo, you did. Lose Rey, we cannot.”
He also says something along the lines of, “Wisdom they held, but that library contained nothing that the girl Rey does not already possess.”
Which, we find out he means literally, but I also think there is a figurative meaning he was trying convey to Luke about Rey’s own abilities and disposition. Basically that she has the right mindset to be a good Jedi.
And I’ve mentioned this before, and I know people disagree with me, but I kind of think a lot of us have just assumed how the Force works without considering that it might be a little more mysterious than we’ve thought.
The Force, through the lightsaber, called out to Rey, even Maz described it as such. The Force called Rey to the Tree on Ach-To. The lightsaber flew into Rey’s hands not because she’s more powerful than Kylo Ren, but because the Force chose her. When Rey lets go of her own desires, the Force is acting through her. The Force has literally awakened, and I feel it plays a more active and obvious role in this story than it may have had in the past.
So the way I see it, it isn’t that Rey just has all these amazing skills. Yeah, she has some piloting, mechanic and survival skills, but that’s from her growing up on Jakku. Her “Jedi” skills are, in my opinion, are based in faith. She starts believing in the Force, especially after Han tells her and Finn about the Force and the Jedi.
I’m not trying to say your guys’ own interpretations are wrong or anything like that, but if you think of it this way it might be easier to rationalize. When I try to picture myself in her position, learning that stories of Jedi I grew up on were real, that the Force is real and that it is calling to me too, it helps me sympathize with how she is afraid of this newfound awakening within her and her desperation to understand it, like she is in The Last Jedi.
And who knows, maybe IX will reveal more to us about Rey, the Force, etc.
Also wanted to say despite my disagreements with OP and some others, I’m glad you guys feel like this is a pretty positive environment to discuss stuff. I might argue with people on here every once in a while, but it is all in good faith and I enjoy talking about it with you all!