Well I was part of the audience and I can tell you I wouldn't feel relieved seeing her die lol. The only reason she got taken over by evil in the first place was because she had saved the galaxy by sealing chaos within her, and as soon as she knew she was being taken over by it she tried putting a plan in motion to defeat her. She was a hero.
Usagi is super compassionate though and we saw in S in her arguments with Michiru and Haruka that she's not okay with sacrificing for the common good. It would've been terribly out of character to nuke Galaxia after that.
She also refused to kill Black Lady and Mistress 9 because of that too.
Big bads like Wiseman and Pharaoh 90 were different, there was no good guy being taken over/possessed, they were just evil beings so she took them down.
But yeah I feel like this is going to just keep going, so I think I'll take my leave on this thread now, as clearly neither of us are going to change our mind haha
We'll have to agree to disagree.