We are writers.  That means our tools of the trade are words.  Most of us — but not all — are more fascinated with words than we should be.

So, why is it most writing books say nothing about words, except perhaps for telling you things like “eschew all adverbs” (they’re wrong) and for the more extreme “eschew all adjectives” (they’re even more wrong) and for the idiots who imbibed the aesthetic without understanding it (older kid had an English teacher who suffered of this) “avoid pronouns.”

Because they really can’t tell you much about what good writing is at the word level.  Because it’s a matter of personal taste and a matter of fashion.