TLJ was a terrible idea building off of TFA. This was the Skywalker saga. The main character should have been a Skywalker. Rian and Kennedy wanting Rey and Kylo to make out negated that.
Rey nobody is inherently flawed when you are forcing Rey into fighting over a legacy, you give her no attachment to when you kill of Luke after he treated her poorly and you know Leia can't properly be in the sequel. That is what Rian made. That was the "great idea". Rey Palpatine is a clear compromise, to make up for the ridiculous "Rey is drawn to the dark side" BS, while avoiding the obvious answer to that. Like Kylo, she is a Skywalker, who is drawn in both directions. Unlike Kylo, even growing up alone, she choose the light. Even with all the advantages, Kylo chose the dark.
Also why do we ignore that Kennedy put her hand on the scale for both of JJ's movies, but not Rian's, which actually did fracture the fanbase?