The wizard guides the user through the document by offering input fields. These input fields range from simple text input for things like the document subject to picking experience for instance for picking a contact person for your document. You could, of course, create input fields for all elements you want to display in your document, but that would not be advisable as you would deny your user all the editing features your Office application can offer. So its best to limit the Input fields to the minimum possible. Said that the input fields offer a great user experience in areas your Office application can not. So, for instance, picking from a list in SharePoint and having multiple properties of the entry you picked displayed in the document is something your Office application will not be able to do out-of-the-box. Additionally, when you want to enter a specific value just once and have it shown in your document multiple times it is often easier to use an Input Field for this than rely on the built-in features of your Office application.Why you should use Input FieldsOffer a picking experience to select a userOffer a date picking experience that can be displayed in different formats and languagesOffer a guiding through the documentMany Input Fields are already filled with default values, which makes working more efficientWhy you should NOT use Input FieldsWhen individual formatting is needed