system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars] Why is Darth Vader's suit technologically inferior to General Grievous'?

The technology existed to create a fully hybrid man/machine with lightning-fast reflexes and superior strength during the time of Episode III. Why wasn't Vader put in a similar suit?

The answer can't be because Anakin would lose access to the Force. Despite having no force abilities at all, Grievous was able to fight and defeat many highly-skilled Jedi.
gpt
Actually, it's entirely because he'd lose access to the Force. Grievous killed quite a few Jedi, but none of them were on Anakin's level. Even as Vader, he was more powerful than most of the Jedi that existed at the time of the Clone War.

As a Force-user, Vader was far more powerful and threatening than Grievous ever was. He was also better equipped to hunt down Force-users that escaped Order 66. Remember, there's more to power than brute strength.