system
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human
[Star Wars] Why Does Palpatine Need An Apprentice?

I understand the rule of two and consolidating power. But Sidious changed the game, he could have rewritten the sith code. Vader was of course instrumental in saving his life and wiping out the Jedi. Then Kylo Ren helped take out Luke’s academy. But after Ren cut down Snoke why didn’t he just say “you know what,….I got this. Fleets almost ready, I’ve got all my sith acolytes, done deal.” And then just kill everyone. 

I get that the new trilogy really dumbed him down as a character but looking back he would have won if he had just done everything himself after Anakin saved his life.
gpt
>Two there should be. No more, no less. One to embody power, the other to crave it.

That's the core tenet of the Rule of Two as said by Darth Bane, who set it all up. And through almost every action Palpatine has taken in all three trilogies. We know he loves the idea of this philosophy
 
He loves having subordinates around who vie for control and power, he loves having an apprentice he can talk down to and treat as leaser. When he formed the Galactic Empire he structured every branch of the government to follow the ideals of this philosophy
 
With there always being someone at the top and people who are set up specifically so they'll crave that spot and want to take it. And we know he actively encouraged such thoughts. 

He didnt change the Rule of Two, and couldn't, because he's a megalomaniac who craves that kind of power over others, revels in having a second in command who is always a dozen steps behind.

This is especially notable in just how much pleasure he takes in having Count Dooku killed off and showing a resurrected Darth Maul just how insignificant he is in comparison.