If your case is simple (no arrests, not too much travel, etc.), don't bring extra documents. If you suspect that something in your case might raise questions, bring documents to support your claim.
Taking all the documents with you to the interview is not only when you have any arrest or too much travel, but all those documents could be asked to present even in a simple case as well. Do not forget that files/applications do loose documents within USCIS while transiting from one dept. to another. Besides, some officers do want to ask some documents again. So I don't think that people should take with them only those documents that are mentioned on interview letter because interview letters are sent by another dept. than the assigned officer on the case. Plus, interview letters are generic letters than a case-specific.
Keep it in mind that not taking all the relevant documents with you doesn't mean you will not given an opportunity to submit those documents if those are required by the adjudication officer, but it will certainly delay the case. For how long, then nobody can say it....could be a few weeks or even few months or even a year or two.....
Having a document to present upon ask could also help many ways. For example, there was a case wherein applicant had a criminal charges filed against him but he was never arrested. A few years later charges were dismissed but that person was never been arrested, fingerprinted or appeared in the court. He was charged in Las Vegas for writing a bad check (casino marker) and he lives in NJ. A few years later he paid the money and charges were dismissed but he did disclose this incident on his citizenship application.
During the interview officer demanded CERTIFIED copy of court-disposition which applicant did submit. Office took a review and stated that applicant was arrested but applicant was kept refusing by saying that he was never arrested nor the court disposition was saying anywhere about the arrest but officer was kept insisting to him that he was arrested. Officer didn't make the decision that day and called the applicant a few times in two months period to admit as if he was arrested but applicant stood by his truth that he was never arrested. After 3 months later his case got approved.
I believe that applicant had the opportunity to say his side of the story on the interpretation officer made on his criminal case after producing that document in person which he might not have if he would have just mailed to the officer later on because then officer might just have denied his case based on how that document was interpreted. Then applicant would have spent time, money, energy and efforts to filing all kinds of motions for reconsideration and appeal to say his side of the story. So its better to have all the documents at the time of interview in my opinion.