This is the recommended conversion to Word option because it offers the most accuracy and editability. It will retain background graphics, as a background image in the converted output, as well as the textual layout using the layout of the original PDF document for guidance. For most documents, this will provide the best looking output in a format that is simple to edit. As such, it is the recommended format for most documents, and hence is set as a default PDF to Word conversion option.
This article refers to Able2Extract and Able2Extract Professional.