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My rule of them is to cut down my adverbs and qualifiers to at most whatever its recommended amount is, have only 20% of the total number of sentences be 'yellow'/long, and only 10% be 'red'/run-on sentences. It's to literally highlight common writing problems so that you can think twice and make a decision on whether or not to keep them. The point of the Hemmingway App isn't to get rid of all the highlights, but to make a decision about them. Not crazy, but are putting too much thought and effort into "clearing out" the highlights. I can't blame the consumer when the app is called Hemingway and pretend to fix your writing, with a heavily implied focus on fiction writers. If you try putting any novel in there it will light up like a Christmas tree and you'll end up with something that feels like written by a computer. Which again is an example of a red sentence. If you see a red highlight, your sentence is so dense and complicated that your readers will get lost trying to follow its meandering, splitting logic - try editing this sentence to remove the red. This is also a yellow sentence so it is according to them incorrect and should be shorter.
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The app highlights lengthy, complex sentences and common errors if you see a yellow sentence, shorten or split it. It even tells you that this is their intention right away: Hemingway wants everything to be simple and easy to understand with no nuance or personality in it, something far more suited for non-fiction work, just as you say. I am using Grammarly whose advertising is obnoxious but it doesn't pretend to be the definitive answer giving you a "score" of any sort. The issue I have with Hemingway is that it advertises itself as a tool for writers.