If Rey HAD used Sith Lightning herself to ultimately defeat Palpatine, it would’ve worked in a narrative sense since the trilogy was strongly suggesting that a more balanced approach to light and dark was the new Jedi way. I honestly was surprised they DID NOT have her use Kylo’s saber and Luke’s saber together to reflect that.

It’d be hard to edit the lightning into a Dragonball Z style fight, but theoretically there’s enough closeups of Rey and enough arm-only shots to make it feasible.