system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars] Why did Sidious/Palpatine treat Vader like shit when he became robotic (from all the EU comics and ROTJ)?
gpt
Basically he was disappointed in Vader's strength. George Lucas mentioned that when Vader lost his limbs he became significantly weaker and no longer had the potential to exceed Sidious. Palpatine wanted the ultimate apprentice and Vader had the ability to be the strongest force user in history. After losing that strength, the Emperor considered Vader to be nothing more than Maul or Dooku; a pawn to be used until he found a suitable replacement (Starkiller or Luke for instance).