I found plenty in Rey for me to be emotionally invested in. Same for Finn.
shrug
I didn’t mean for it to come across like I wasn’t invested in them as characters, simply that the editing tended to thwart certain important moments. I would also list the moment when Finn and Rey have just left Jakku, a point in the film that was crying out for a quiet scene for character development. Instead the ship immediately starts to fall apart and it’s another distraction for the audience.