You can turn that off. I did at first; all the colors in the English prose I was writing distracted me. I came to appreciate that, though. I realized that I used adverbs and adjectives much more than I intended to, and now they stand out.
Along those lines, I've also realized that I overuse "great", "love", "hope", "literally", and "but". I added those to iA Writer's custom patterns, and now it pesters me when I use those words. Sometimes I mean to, but I literally love to put them in every sentence and hope it turns out great. iA Writer says, hey, you might want to reconsider your word choices.
But what do they know about fiction? :)
But what would Rowling know about storytelling :)
I have never even read Rowling, nor have I read King. But such restrictions and imposing of so called “rules”, or what is good what is not, are absurd when comes art. I would urge anyone to not let such decrees by the famous to dictate their style, let alone a software.
“Adjectives are frequently the greatest enemy of the substantive.” – Voltaire
“[I was taught] to distrust adjectives as I would later learn to distrust certain people in certain situations.” – Ernest Hemingway
“The adjective is the banana peel of the parts of speech.” – Clifton Paul Fadiman
“[The adjective] is the one part of speech first seized upon and worked to death by novices and inferior writers.” – J.I. Rodale
“Use no superfluous word, no adjective, which does not reveal something.” – Ezra Pound
“The adjective has not been built that can pull a weak or inaccurate noun out of a tight place.” – E.B. White
“[Whoever writes in English] is struggling against vagueness, against obscurity, against the lure of the decorative adjective.” – George Orwell
“Most adjectives are also unnecessary. Like adverbs, they are sprinkled into sentences by writers who don’t stop to think that the concept is already in the noun.” – William Zissner