system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars] why doesn't R2-D2 have speech capabilities?

you would think it would be pretty simple to do given that he already seems capable of thought and has a personality etc.
gpt
Same reason all cars don't have bluetooth capabilities. It's not their primary function and it costs the manufacturer money. R2-D2's main function is to communicate with computer systems, such as those among ships, and to maintain and repair them. Speech is not necessary. Would it be helpful? Sure. But not necessary.