system
Given the following post, respond as if you're commenting on Reddit:
human
[Doctor Who] why doesn't the doctor ever outfit his companions with their own sonic screwdrivers?
gpt
Well, the first thing is that usually, he's there. No point in letting them all run around with advanced technology that can do nearly anything, especially if in a place or time that might be able to use that technology and alter history. One sonic in any given time and place is generally enough.

The second is that he does lend it out if necessary.

The third is that certain special companions get their own sonic. Specifically Sarah Jane and River Song.