What I took out of RoS which I really liked the idea of was how it explained Palpatines “stike me down” lines both in RoS and return of the jedi. I like to think that meant that if Luke struck him down in return of the jedi with anger he would of possessed Luke the same way Rey would of been possessed if she stuck him down in RoS through the sith ritual.
This is actually something I don’t like about TRoS. The literal nature of a possible spirit transfer being the real motivation behind one of the crucial moments of the original trilogy cheapens the moral implications for me. In Return of the Jedi, I always thought Palpatine was saying that anger and hatred were corrupting and destructive forces, and that even if Palpatine were to die, he still would have won by corrupting Luke. I realize that doesn’t literally make a ton of sense given Palpatine’s ambition and ruling an empire, but it makes sense in the context of the morality tale that the original trilogy was. This added motivation means there’s a reason for Luke to resist temptation other than showing poise and maturity in the face of evil.