I think Kylo ultimately just turning good and dying was unfortunate and sent the whole ST down the drain of redundancy (I look at the movies on their own and I like TROS, but within the larger context it’s a disaster). You can’t just repeat things again and again or people will ask what was the point. We already know someone evil like Vader can be redeemed.
I think there are a lot of ways this could have gone down better. TLJ leaves the door open to go dark (DOTF) or light (TROS). The issue is neither DOTF or TROS fully commit to the path.