In my experience the worst part about Word is collaboration. Have you ever seen the track changes interface? It's a sea of incomprehensible, badly segmented, changes where every switch from bold to italics is counted as a separate change mixed in with actual substantive changes and has some little red line among thousands of indistinguishable little red lines pointing to some unclear place in the document. It's a totally unusable interface, and yet some highly collaborative industries (ahem, law) are stuck with it. It's horrifying.

I have seriously considered offering to pay people with whom I'm forced to exchange documents (especially academic law review articles which tend to have thousands of edits) to learn markdown and git just so I don't have to eyestrain my way through that track changes screen