The new DOCX exporter provides tables with the text as payload instead of frames. This allows to a certain level the generation of letters. These letters can be changed somewhat by office workers. Simple text changes (correct typos) possible.
One problem occurs:
Page header and footer band occur in page flow and move for instance the page number to another page if text is changed too much.
Contents of page header and page footer band should be placed in DOCX as header/footer with correct height.