There is a (unknown) limit to how much text the "Content Refiner" can process. When I tried to edit my 1,600-word blog post, I crashed the app.
2. The app should also have an autosave function because if you refresh or restart the app, you lose 100% everything you've worked on!
For this reason, I advise you to record every line of text produced by the software in a separate Word document!