I want to make it VERY CLEAR...no one is saying that you WILL get special treatment for being polite. I think you are reading far too much into what myself and others like Kateg are saying. And believe me, I understand your frustration and how easy it can be to overthink it. I'm also sorry to hear that your application was rejected.
The point I was trying to make is that it CAN be the difference when it comes down to a small decision that the CIC agent has to make. In a process where you have little to no control, by being courteous you are influencing the very small part of the process that you have some sort of control over.
Personally, I wrote six letters of explanation for my wife's application. They were all required for various reasons and none of them we're uploaded in the "Optional Documents" section. I could have wrote them extremely succinct and short, but I chose to add in a couple of extra lines to remind the agent reading them that my wife is a human being, with a child, and a career, and not just another statistic. Will it help? Who knows? probably won't make any difference. But with it being the small piece of the application that we actually had control over, I can walk away feeling like I gave it my best shot.
I also want to point out that I was able to do this in a very professional way, I don't want someone to get the wrong idea and write a letter that comes off as begging.
Please don't misconstrue my words to mean "it's all under their discretion."
Believe me, you don't understand my frustration. And the fact that you have uploaded some letters that no one asked you to, and you and the others are saying that if we are not polite, we might get treated differently is a BIG BS!!!
If you remember how to upload files and submit the application, there is room for only the docents they request and explanation letter. If you wrote 6 'professional' letters, that's your problem. We're not required to. And if any of the officwrs there think like you, then I'm better off Canada. As this is all BS.