On the same line of thought, one thing one of my casual star wars watching friends noticed is that to them Rey felt more like she was a supporting character for Luke and Kylo’s stories, rather than the lead character she was touted to be in TFA, and I can’t say I disagree. Now, as a director I can’t say my own ideas would be any better than RJ’s, but my idea to fix it would’ve been to at least give Rey her own plot point in having little to no control over the force. Like her force abilities are growing faster than she is able to keep them in check.
I feel doing that, it’d change the dynamic of Luke and Rey’s lessons, with Rey growing more frustrated that Luke is focusing more on telling her why the Jedi were bad than actually helping her with her problems. It’d also give Rey a reason to turn to Kylo for help, as he could actually be trying to teach her what she needs to learn, rather than a vague sense of, “I still feel good in him.”
I like that idea of yours a lot. When I re-watch TLJ there is something ‘amiss’ with Rey… Daisy Ridley did a superb job, Rey’s in lots of scenes and central to the story, her powers with the Force have been somewhat explained - yet for all that, there was something missing; something not quite right… maybe it’s just that there is just so much going on in TLJ?
Yet your idea with Rey coming to grips with mastering or controlling some of her Force powers… that’d be very interesting to see in a Fan Edit (if such a thing could be done) - and does seem something of a missed opportunity here in TLJ itself.
I do hope she gets more of a central role, or more ‘stand-out’ role for Episode IX.