She has family issues he always seemed okay with.
That’s just a plot point, it’s not a weakness. Rey doesn’t seem to be shaken by either one of her family reveals, unlike Luke who was shocked to his core by Vader’s revelation.
That’s funny. “Just a plot point.” It’s literally the primary motivator of just about everything she does. “Not a weakness”? Kylo Ren literally calls it her “greatest weakness.” They spelled it out and people still don’t get it.