If it’s strictly Palpatine vs. Rey, then yeah I agree. I’m working on emphasizing the “I am all the Sith” idea throughout the movie, with Palpatine’s current body literally containing the spirits of the Sith that came before him. If this is included, it wouldn’t come out of nowhere, it would be built up throughout the movie whenever Palpatine speaks.
I definitely would like to see Palpatine’s Sith scream - most will know from Revenge Of The Sith; implemented into his death some how.