Ulbosin, I totally agree with that you found the content of the article doesn't match with what is written on the title. But I firmly disagree with that the writer should have provided the negative sides of hard work at the same degree with positive sides. He didn't miss to write negative sides, of course, he wrote them at the end. And that he preferred writing them at the end of the article was good idea. If he wrote the negative sides in the middle or somewhere we couldn't get what his purpose is actually.

And if he wrote negative sides equally with positive ones the article might have lost its persuasive function. As you know article should lead readers to think what the writer is trying to direct them and persuade them to one point, not two or three which is rather confusing for the readers