Realization from exchange with
C3PO, unlike R2D2, was premium mediocre. Mediocre robot with superfluous "premium" features (anthropomorphism).
Most anthropomorphic robots are PM unless there's a reason for it. The reasons to make robots human-like are weak.
Conversation
At the risk of looking like one of those nerds... Threepio was designed for social interaction and having more visually in common with humanoids theoretically makes him easier to relate to.
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the weakness of that argument for going anthropomorphic is why he is PM. Is your google translate app in the shape of a "protocol droid"? :D
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Being a protocol droid, his purpose was to interface with people, granted..
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If they have a similar form factor they can also be easily stored in things like chairs. They can use stairs. I.e. In environments designed for humanoids they can more easily adapt.


