When asked to give an account of the previous day, most people have to pause and think before remembering what they did. The problem gets magnified when asked what they did, for example, last Thursday. The problem gets even more magnified when collecting factual accounts of an entire street of people for a week.
One can only imagine the level of complexity reached when dealing with the history of a town, then a region, followed by that of an entire country. The human brain cannot handle such complexity in many instances. So, we end up with historians coming up with some or the other pithy narrative of what they think happened. This is the basis of the narrative fallacy.
So, in studying history, one needs an extra level of rigor to avoid the narrative fallacy. Then, the next step seems to be that the personal diaries and individual accounts of people living in those times are the best resource in such research.