Doing the same thing in the same way creates a pattern that helps a reader follow along.
On this page I've used a parallel structure for the tips. Each one is written as a command. I used the imperative mood (the command) because these tips are vital parts of writing. I used it in each case because that creates a pattern your brain picked up by the time you reached Writing Tip #3.
If I had changed Writing Tip #8 to "Details are important," your brain would have registered the shift in structure and for a moment would have flickered away from what I want you to do:
accept these tips,
become a stronger writer,
sell lots of books,
advance the general quality of written English in the world.
Human brains love pattern. Give your reader's brain a pattern and your ideas will come through like sunshine through a window. Your reader will
take you seriously,
recommend your book,
change the world...