There is no need for an argument. All a person needs to do is follow the directions. If he has a special situation that he thinks will be helped by including extra documents, do so. If not, don't. I don't think (and that's just a guess, as is everything that doesn't come from an official source) that a person's application is harmed by including extra documents, though apparently you do. In fact, I think some extra documents can be helpful. Take NOAs, for example. Apparently, they will be required when the new rules go into effect (only the years a person files a tax return will count), so how can it hurt to include them now? How about cover letters? There's no mention of them in the instructions, yet many people seem to include them, especially if they have something that needs to be explained.
As to the OP, there are three possibilities: 1) he was destined to receive an RQ, no matter what, or 2) he got a lazy citizenship officer, who simply sent out an RQ without reading the attached documents, or 3) the documents didn't answer the specific questions the officer wanted answered. You might say he got an RQ because he included extra documents, and I might say he did not, but they're both just guesses. The fact is that we don't know the specifics of the case, so we can't say why he got an RQ.