Is there any explanation given in-universe or any logical way to explain why Grievous's robotics improve his physical abilities so much while Vader's suit limits his? Grievous, before getting suited up, was just a good warrior of the Kaleesh species. Dooku tried to infuse him with the blood of Jedi Sifo-Dyas but that supposedly didn't work. So the only explanation for why Grievous is powerful enough that he can kill lesser Jedi is that his suit greatly amplified his physical abilities? However, if this is the case, why wouldn't Vader's suit do the same? And for that matter, if a non-Force sensitive like Grievous can control 4 arms shouldn't a strongly Force-sensitive like Vader be able to control 6 or 8 arms but instead his movements are pretty restricted with just his 2 arms. At the end of the day, is there any legit in-universe explanation that makes sense or does it just come down it the fact that Vader was played by a guy in a cumbersome suit who could hardly see?