I have more freedom when I write fiction, but my memoirs have had a much stronger impact on my readers. Somehow the 'message,' even if I am not even aware that there is one, is conveyed better in this form.
A lot of the changes are so gradual that they don't even qualify as news, or even as interesting: they're so mundane that we just take them for granted. But history shows that it's the mundane changes that are more important than the dramatic 'newsworthy' events.