system
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human
[Star Wars] If the Sith continued to exist after RotJ, how would Sidious be remembered by future Sith? Would he be revered as a legendary Sith Lord or an absolute disgrace and embarrassment?

On one hand, he does create and rule the first Sith empire in thousands of years AND he nearly wipes out all Jedi in the galaxy.

But on the other hand he failed pretty majorly as a Sith master for having an apprentice that turned to the light side. Not only that but he went out like a bitch! Just picked up and tossed over a ledge. No epic battle for his life, he just gets thrown like a rag doll down a hole, screaming.
gpt
He'd be revered, and also seen as a warning. 

Sidious wasn't just a Sith Lord, he was the culmination of a millennia of Sith getting stronger with each generation. Distilled power. And that wasn't the most dangerous thing about him; it was his intelligence that was deadliest. The Sith would have taken this as a lesson -- power without purpose or cunning is power wasted. 

His eventual death would have served as a warning to always be on guard. He did not fail, he simply grew too overconfident in his victory, like many Sith do.