Thesis writers have a vast knowledge of the subject. You can ask them any questions you may have, and they'll be more than happy to answer them. Often, writers will meet with you before they begin work to learn about your requirements and your academic level. And while you can communicate with your writer through email, you'll have the option to ask questions and provide feedback. A good thesis writer will also follow your requirements. So if you need a professional to write your thesis, there's no reason not to.