Eh, I consider this the "high school English essay" philosophy, where the more you write, the better. But for scientific writing and business writing, one of the best things you can do is simplify your writing, take out everything unnecessary, and write concise statements. I mean, the AdCom member reading your secondary will have to read your primary, your PS, your secondary... multiplied by however many he has to get through that day. Do you really think he's going to read every word once your start rambling? I assert with confidence that you probably sound a lot more interesting to yourself then you will sound to them. Better to write something short that answers the question and they will read all the way through then ramble and have them skim.