Apart from tone, which tends to get confused or misunderstood in a venue like this, I wholeheartedly agree with NOT sending anything other than what is specifically requested (with isolated exceptions, like submitting a supplemental explanation if necessary to clarify otherwise incomplete or potentially misleading information, and even this should be avoided if possible).
There are NO additional documents which move the needle to "the safe side." As @sistemc suggests, additional documents are MORE LIKELY TO RAISE QUESTIONS. That is to say, "to be on the safe side" it is better to FOLLOW THE INSTRUCTIONS, which includes submitting what is asked for.
Bottom-line: if IRCC has concerns about the applicant's physical presence, there will be non-routine requests for additional information or documents. And over the course of the last decade there have been NO reliable reports that submitting any additional documents with the application avoids this.
But, on the contrary, there have been many, many reports (including internal CIC memos obtained through the Access to Information process) of applicants getting RQ notwithstanding having already submitted the equivalent of a RQ response with the application. LITERALLY . . . for example, internal CIC memos referenced a case in which the applicant's LAWYER assisted the applicant in submitting all the documents typically requested in RQ, with the application, and the applicant was nonetheless required to again submit the documents in responding to RQ. And actually this makes sense. The processing of a citizenship application is a BUREAUCRATIC process, and bureaucratic processes work best according to specific procedures handling particular tasks in a precise order based on defined criteria. Such systems have their limitations and flaws, but they are designed to facilitate a process-flow which comes as close to going through a checklist as possible . . . and for citizenship, the routine case literally follows a File Requirements Checklist right up to when the file is delivered to the Citizenship Officer to make a decision about the applicant.
That said, including a FEW extra documents, like NOAs, is not likely to cause a problem. Not at all likely to help. But in general, just like responding to a border officer's questions, or in responding to a police officer's questions, EXTRA information tends raise questions. Best to FOLLOW the INSTRUCTIONS, answer the questions asked, provide the documents requested. That is as close to being on the safe side an applicant can get.
Being on the "safe side" is far, far more about making a judicious decision as to WHEN to apply.
