On Writing Well

I found the first three chapters of this book very interesting, but at the same time I feel like Zinsser has just told me that everything I have ever written has been incorrect. First of all, what i did find interesting was all of the long phrases that we all use instead of the simple word which is the phrase's real meaning. "Don't inflate what needs no inflating: 'with the possible exception of' (except), 'due to the fact that' (because), 'he totally lacked the ability to (he couldn't), 'until such time as' (until), "for the purpose of' (for)" (Zinsser 15). Upon reading this part of the novel I realized that I do write with these phrases and phrases like these. It is interesting to see that sometimes the excess words are unneeded. However, I also feel that sometimes extra words provide more description and insight on what the author feels or thinks. I feel like so many people write with these supposed "unnecessary" words. If what Zinsser says is true, then how many authors have been writing in this so called wrong way all their lives? What would Zinsser calling writing of authors such as Shakespeare?