I think I agree that Rey’s parents shouldn’t be good, and I think there’s plenty of better reasons why she’d hate Palpatine. It’s a blatant contradiction to what was said in the last film, and since these 2 sides are both coming from Kylo, it takes away from what he’s saying now. Besides, Rey doesn’t even seem to remember her parents at all throughout the trilogy, and we spent two movies dwelling on them. I think that removing them from this one is worth it to push her character along.

That being said, I love the force creation angle. Personally, I would say that Rey was a creation of Palpatine, while the Skywalker’s are a creation of the force. That makes the premise of the dyad stronger as Rey and Kylo are inverses, and adds more weight to Rey taking the skywalker name at the end.