Rian fundamentally misunderstands the force in TLJ.
Luke: “Balance - Powerful light, Powerful darkness.” is a reductionist corruption of George’s idea of balance. The darkside is the imbalance - an abomination of the force, the Light represents the force when it’s in its truest nature- balanced. The idea that light and dark represent The ying/yang in the force is something George opposed vehemently and to me highlights just how out of touch the ST is with the 6 film saga.
But wasn’t that Hermit Luke, who was supposed to be in the wrong? It seems like that’s one of the major areas where people misinterpret the themes of TLJ. At the end, he renounces everything he said while on the island, and says that he “will not be the last Jedi.” You could say it’s another issue that the 3rd act spends most of its time undoing everything the first two acts did, but most of the stuff people say in the first two acts shouldn’t really be taken seriously when it comes to examining the themes of the movie.