I just think Microsoft Word is actively making the entire world less efficient. It's not made to produce documents that are easy to read. Don't have an obvious contender though. LibreOffice Writer just tries to be the same shitty product but free, LaTeX is way too technical and has horrible error handling. Markdown usability and quality breaks down if you make any serious use of tables and figures.
Since I'm not a US citizen I also think it's a threat to our country that our entire administration and every company is dependent on storing documents in an effectively proprietary format controlled by a US company, on cloud servers controlled by a US company. If compelled by the US government, Microsoft could put all of EU to a halt with the flick of a switch. National security calls for formats as central as this to be open standards supported by multiple competing products.