Hi Carrie. As a scopist, I use either the update area or the job dictionary, depending on my client's wishes. When I D-define something, it goes into the user's update area, and every few weeks I will send that to my client so they can look through it and add what they want to their personal dictionary.
I have not heard of a reporter using that area. I'll be interested to see what other answers you get.
We reporters were encouraged to use the update area in the beginning, but in the last few years every time I go to one of Cindy Hartman's classes, she says don't bother anymore. So I don't. No difference. I do my own scoping and I'm pretty sure when I make a D define that I want it in my dictionary, so no reason to waste the time reviewing it later in the update area.