Anakin Starkiller said:
Imo, it doesn’t violate anything. Palpatine isn’t living forever, he’s just Voldemorting; cheating death in little bits at a time, slowly losing his humanity in the process. He hasn’t conquered death, only stalled it.
I agree, honestly. Even with that’s just shown in the movie, it’s clear that this is not a permanant solution, and I suspect that his soul have rotted through Ben or Rey in time, too, or even his healed body towards the end.