The more I think about it, the more I like the idea of ending TRoS with Rey sacrificing the entire Resistance to destroy the entire Final Order, sorta like the Moment in Doctor Who. It’s a pyrrhic victory. Everyone is dead except Ben and Rey. Makes for an ending that’s decidedly quite different than RotJ and somehow feels more poignant.
It also works really well with my rhyming scheme where the Prequels and Originals are opposites and the Sequels are a balance between the two. The Prequels end badly, the Originals end well, so it only makes sense the Sequels would end bittersweet.