The ability to write, especially a long but coherent technical document, is dependent the ability to analyse and structure a vast number of ideas and concepts according to importance and how they fit together.
This is strategic planning, and it's an extremely important skill to develop. As well as other benefits in communication, writing is a good way to practice with a static target.
Also, as the article says, often you need to write a lot down just to get it out there before you can have a good feel for how it connects together. The same is true for developing new strategy - if you don't have to write pages and wish for bigger sheets of paper†, you're doing it wrong.
This is strategic planning, and it's an extremely important skill to develop. As well as other benefits in communication, writing is a good way to practice with a static target.
Also, as the article says, often you need to write a lot down just to get it out there before you can have a good feel for how it connects together. The same is true for developing new strategy - if you don't have to write pages and wish for bigger sheets of paper†, you're doing it wrong.
† Metaphor alert; you don't actually have to.