My first impression was that this was a classic example of Zeerust: why have a humanoid robot type data into a system, instead of just directly interfacing with the system?
Almost simultaneously, though, another thought struck me: Wow, that's one way to check the spread of viruses and malicious software.
Not quite so "quaint" from that perspective, is it?
A few other Perfectly Reasonably Explanations occurred to me later -- it's easier to establish some degree of uniformity in user interfaces than it is in underlying code, for instance. quelonzia's iMac, my Ubuntu box, and that Windows PC that's over there all have mice and keyboards and monitors, but I'll be damned if we can get their supposedly-compatible file-sharing protocols to talk to each other. Spread that across a Galactic Empire dealing with the patchwork remnants of a Republic, and see if you don't wanna just put a droid at a keyboard.