None of that matters anymore because apparently anyone can revive people with the force now
Edit: thanks downvote brigade
https://www.thewrap.com/star-wars-the-rise-of-skywalker-the-20-worst-parts-of-episode-ix/
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Spoilers [spoiler]I think they handled it ok. It was a stretch, but not unrealistic that Rey healed Ben's wound. As for bringing Rey back from the dead, it was balanced. After all, the act killed Ben. A life for a life. On the others, there were no such consequences.[/spoiler]