You should know well how much efforts the professional editors spend on learning the basics of their work. You would understand more brightly, if you ever tried following simple steps to writing a grant proposal. It takes one's lifetime to grasp the necessary elements of brilliant editorial and authorial abilities. And even then the editors check with the rules and standards anew all the time, because of their permanent changing and rewriting. It is practically impossible for editors to know everything. That is why the constant training in writing and proofreading is needed, and it is what makes a difference between a specialist editor and an amateur so significantly immense.