The music. I also am not a fan of using Burning Homestead for the third time, but we just couldn’t find any other music to fit the moment.
Duel of the fates? ( ͡° ͜ʖ ͡°)
It wouldn’t fit. It’s supposed to be a triumphant moment when the Force Ghosts rise up against Palpatine, and a cue originally intended for a battle scene wouldn’t really fit that.
Hal already added a minor repeat of DOTF during Rey and Kylo’s duel, so it isn’t really necessary to play it again.
What about Leia’s Theme? I know Leia isn’t there, but The Empire Strikes Back used Yoda’s theme during action scenes involving Luke to symbolize how he had learned from Yoda, so since Leia taught Rey it might be a cool parallel. Not to mention, Leia’s Theme is one of the best pieces of music ever written.