I've worked with editors at Fast Company, Entrepreneur, TheNextWeb and others, and I have not _ever_ tried to read a book to make myself a better writer. What does that even mean?
And on numerous occasions I have gotten away with submitting first drafts that get published "as is" without anyone telling me otherwise. Am I some omnipotent writer, or were the editors incompetent? I doubt it.
I think what a lot of people also don't understand about writing is that some of the best work out there (articles, books, etc.), for the person who put it out - it can be compared to having participated in a triathlon because it has THAT immense of an effect on your mental state of being.
Want to be a better writer? Find out what your passion is and write about that. No book and no order of semicolons is going to make you "better" unless what you write about is what lights the fire underneath your feet.