I agree with the general sentiment, but I still think Palpatine’s survival would’ve worked best as TLJ’s cliffhanger.
I pointed out that it’d undermine its message of hope.
It does not work like “I am your father” because it was revealed in a trailer.
I’m saying that in the mindset you don’t watch the trailers and only the actual movies without any information. And I address this in the comment itself.