We started getting history records only when writing systems were invented. If today we are aware of facts dating back thousands of years, it is because of written records.
Bloggers, such as ourselves, know that written expression is a step more profound than thoughts. It is more defined and steadier than fleeting thoughts. We also can revisit words and the content of our expression (emotions, memories, ideas, opinions).
Moreover, writing forces words out. Whatever we want to express must be shaped with words. It forces definition, shades, precision, and this is hard to achieve with thinking alone.
Personally, I write in terms of overall content, and I think and express conclusions.
Different modes and purpose, but I stick to my guns here. Writing is a tool for awareness.