Luke can fly and shoot a blaster in the first movie, trains with Obi Wan, listens to his advice and sees his examples, and has one split second where he fires one shot with his ship using some force intuition. Then in the next movie, Luke trains almost the entire movie, learns how to use his senses and increase his physical prowess generally. Then goes to fight Vader and loses badly, and nearly dies. Then trains on his own and comes back in the next movie looking like a completely different person. His personality has evolved, his outfit, his skills. It takes him that long, and only then do they refer to him as a Jedi. And this is with Force Ghost advisors whispering in his ear frequently.
It's not like I want training scenes to drag the movie down just because. Those are legitimately some of the coolest parts of the movies I like. The first Matrix movie is great for this reason. Imagine if Rey trained with Luke for real, and learned some interesting new aspects of the force since Luke spent 20 years at the first Jedi temple with all the original texts? Instead she learned nothing really. She meditated one time, and beat Luke in a sword fight.
My guess is they're going to do this in the time skip between VIII and IX and she'll be reading those books on her own. And I think that's cool. But they just rushed her ascension too rapidly in the first two movies, and she had very little she couldn't overcome on her own without training.