The problem isn't the occasional stutter in the writing. The trouble is the over use of such things. Rules are, so far as I am concerned, there to be broken. It can become tedious to read, however, if it is a constant. Consider beginning every sentence of a paragraph with the same word or referring to someone with the same pronoun constantly. It may be technically sound, but it makes for tedious reading.

By the way, lest anyone think I am an arrogant hack (and I am) I am just as guilty of many of the things I preach against. Read some of my first works and you will see terrible tendencies like starting sentences with "and" and poor editing. Yup, lots of ugly shit to be had.