I suppose my tendency to collect and organize documents is a coping mechanism for my notoriously insufficient memory. I retain far less than my peers, and will often vaguely remember having read something on a topic but have no recollection of the details or where I read it. Even topics that I go deep on and write about extensively in notes or communication will be largely gone from my mind in months to a year. So my document collection forms a kind of artificial replacement for the memory I never had.