system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars] Is there a particular reason Protocol Droids are so stiff and inflexible?

C-3PO always looks like he’s having a very difficult time moving around. Is there any practical reason for this?
gpt
Someone's going to respond "because he was built in a tatooine slave hovel with a box of scraps" but we see the same thing with other protocol droids of the same model as well.

I think the most realistic answer is because he's designed to be a diplomatic aide, not a bodyguard. He's supposed to set the other party at ease by obviously being not a threat.

It's obviously not a universal design scheme - there are plenty of menacing and threatening diplomatic droids across the galaxy - but it's the one that explains his behavior the best to me.