When I read docx and then save it, it doesn't look like original document. It has no equal styles for text block and tables and there are new line breaks.
Example with simple tables:
$objReader = \PhpOffice\PhpWord\IOFactory::createReader('Word2007');
$phpWord = $objReader->load("with_table_macros.docx");
$phpWord->save("re_with_table_macros.docx");