This is a nice read. I agree to most of your points here.
Especially dropping irrelevant content to any publication without knowing the type of content they publish. Therefore it is always helpful to read their posts before submitting our content.
Most of the time title and subtitle also matter and it can give us rejection. Sharing draft with close friends can be helpful.
I had publish a similar content on Better Marketing few months back and it had good feedback from people. This content will also help many people in evaluating their strategy. Good reading.