What document request? You only mentioned pre-arrival email. Processing location doesn’t always mean anything. IRCC tries to distribute files across many offices.
Prearrival letter can be sent at any point after eligibility so is not a good marker of progress of a file or a good comparison point between applications.
what exactly is the point of you repeating information that is not only redundant but also perhaps demoralizing to people who are actually going through this process?
why is not responding in a thread ever an option for you when you clearly have nothing useful to add.