I'm a programmer, I know Word exists. If someone wants me to produce a Word document, I can take all my content that's in markdown and generate a .docx file. I can also generate dozens of other formats, all from the same raw material https://pandoc.org/demos.html

I haven't yet seen a tool that can take a Word document and transform it as neatly and automatically into many other formats, although it's gotten much better since things like Open Document Format compelled Microsoft to ditch the all-binary .doc format and move to the mixed XML/binary format used now.