I do agree with you Testing that Palpatine needed to be brought back to some extent. The story of the overall saga needs to be rooted with Anakin and his struggle with the devil (Palpatine).
So they got part of that done right… but then missed the mark completely by not having Anakin included to a certain extent with this generation going up against him.
Yet again, I refer back to Kylo who should have essentially been the stand-in character for Anakin. And I feel that would have been conveyed much more clearly if he survived.