Knowing what you intend is powerful. Whatever else consciousness does, it is particularly effective at pointing the whole mind towards a particular outcome. You can't always get what you want - but if you try sometimes, you might find it's easier to like what you get when you think about what effects you intend to have on readers and on the world.
Think about the difference between the writers with these two intentions:
I have to write an email about the meeting next week.
I am going to send an email so that people remember to come to the meeting next week on time and fully prepared.
Which writer do you think is more likely to get what she intends?
The largest portion of your writing is probably largely routine writing. It's easy to give up forming an intention and go with the flow of writing 'about' whatever seems to be required. Don't do it.
Before you write anything at all, decide on the feedback you want to get as a result of writing. What will you see, hear and feel when you transform your intention into reality? Knowing what you want is the first step to getting what you want.