Rey should struggle with being no one
Keep in mind that Rey never actually wanted to know who her parents were: she was just waiting for her family to return, before accepting that they will never return, as Maz Kanata points out in The Force Awakens. This is one of the reasons why Rey starting to cry when Kylo made her admit that her parents were nobodies right before he reveals that her parents did not care about her and actually sold her did not make any sense.
In Episode VIII, Rey’s arc should be feeling rejected by her new surrogate family (Luke) and joining Kylo after he lies that everybody she has known in her life has rejected her. In Episode IX, she would find out the truth, redeem herself and reject Kylo, accepting her surrogate family as her “real family” (you know what I mean 😉).
I completely agree. It’s one of the reasons I don’t like Rey in TLJ, it feels too much like it was subverting our expectations. I really wish JJ hadn’t made mystery boxes to begin with and just said her family is no one (Palpatine would still work as a surprise later).