The standards you set for yourself depend on your goals. If your goal is to be a successful blogger or book author it makes sense to set high standards for yourself.

Freud owns a lot of his influence to good writing skills. We probably wouldn't speak of Darwinism if Darwin wouldn't have written a well written book with "On the Origin of Species". Darwin would be much more one of many different biologists if he hadn't written a book that people enjoy to read.

The C programming language owns much of their success to a well written book.