RogueLeader, Neverargreat, there’s definitely merit there. As you say, it turns the ST’s weakness into a strength, or at least something deliberate. Spitballing:

If Palpatine represents (or champions) the stagnancy of this storyline via the repetition of plot points and the stagnancy of the Jedi/Republic, the meta-goal of Rey and Luke should be fairly explicitly to throw him off SO THAT something new can come after. Metatextually a new plot for the franchise, but in-universe a new state of affairs. And Kylo should be that exposition, catalyst for change, etc etc.

So in the real world: Sequel trilogy is repetitive and uninspired, the solution is to conclude it in a way that leaves us with a fertile franchise after ready for something new.

And in-universe: Palpatine is forcing a stagnant cycle for selfish reasons, Kylo at first wants to leave the cycle, Rey (with help/inspiration from Kylo/Luke/Leia) finds the way to end the cycle and bring in a new state of affairs for the galaxy.

I think then you’d need to exposit HOW this helps Palpatine. A stagnant state of affairs where he is in control of everything? Constant conflict (Star Wars) forcing the jedi into distraction away from exploring the deeper facets of the force? Keeping the numbers of Jedi and Sith low giving him more concentration of Force in potential vessels? Forcing the galaxy into a cycle is his view of Order?

Kylo’s motive of “I’ve been manipulated my whole life, I’m out” is cool. And Rey can be torn between that and duty, ultimately being told by Luke that she needs to end the cycle. The more wise force ghosts showing up at the end to help achieve that works best too.

And Kylo’s sacrifice could be better set up with the notion that they’re (via Palpatine) part of the cycle, and one of them needs to die to end it.