The Problem
Website creators are usually professionals of some kind,
and extremely competent in their fields.  However, they are
not professional writers.

Neither are their friends.  Neither are website designers.  

Writing is not something that comes naturally, like talking.  
It's a skill that needs to be both acquired and practiced.  
Unpolished writing contains errors, non sequiturs and

When you read bad writing, your attention is shifted away
from the content and onto the mistakes.  When this
happens, the point of the website is lost.  It might as well
not exist.