I use LO Writer and save an extra copy as docx. The edit version is odt. Word docx works too. Proper use of styles, headings, anchors etc is needed.
Then Calibre is purely a docx->epub2 conversion. I then make other formats from epub.
I also use it to read proofing annotations from the Kobo via Kobo Utilities.
But the main use for most people is managing their library (and series and collections on Kobo).
I upload the epub2 to Amazon KDP, Smashwords and Google.
I also upload doc to Smashwords (for any format other than epub or Kindle) and a dual mobi for random kindles to Smashwords.
The source LO Writer is reformatted for paper editions.
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