Eight years of arguing with Reylo stans about how Kylo's trajectory was to show us the long fall of someone continually choosing the Dark even as his father (who he explicitly acknowledged that he still loved!) and other people in his life repeatedly offered him the same choice Luke gave to Vader in ROTJ.
Eight years of noting that the point of Kylo, for JJ Abrams, was that you can be raised with love, support, and stability and still CHOOSE to make bad choices and continue to do so even when offered alternatives.
Eight years of pointing out that Finn and Kylo were deliberate character foils in TFA! Eight years of saying that Finn was supposed to show that goodness can come from anywhere, even a stormtrooper raised as a child soldier with no one to turn to, while Kylo was supposed to show that evil can come from anywhere, even a beloved Rebel's child with a stable childhood with lots of support figures.
Eight years of trying to get through to them that Finn and Kylo were supposed to represent the two choices Rey had as the sequel trilogy's Skywalker: to follow Finn's choices (Luke's choices) and stay in the Light, or follow Ben's choices (Anakin's choices) and surrender to the Dark.
Eight years has led to this moment of Adam Driver casually going "evolving into Ben Solo…that was never part of it" and “Rian took it into a different direction” in an interview on a random Tuesday night. I feel the vindication in this Chili's tonight and it is SWEET