Because back in the 70s, computerized speech still seamed like something extremely difficult and very sci-fi. That’s why only droids who really need it have a speech module.
Nowadays every cheapo smartphone has speech synthesis capabilities, but back then that was very sci-fi.
Btw, that’s why a ton of modern sci-fi is retro-sci-fi (basically steam punk but with 70s computers), because real tech has surpassed sci-fi in many ways.
bjoern_tantau@swg-empire.de 6 months ago
With the way how stupid LLMs are especially with maths I now think it’s actually quite logical how you wouldn’t want something like that in a droid that is mainly meant to do astronomical calculations.
In the novelization of ROTJ it is also revealed that the torture droid in Jabba’s palace instructs C-3PO to just answer yes or no in order to reduce him to binary because that is something protocol droids are ill equipped for. On the other hand he speaks complex sentences to R2, I guess for much the same reason but the other way around.