One of the major challenges of writing a journal article is to keep track of versions – both the different versions you create as the document progresses, and to merge in the changes made by your collaborators. For most academics Microsoft Word is the default writing tool, and it is both very good and very bad in this. Very good because the track changes feature makes it easy to see what has changed since the last version and who made the changes. Very bad because this feature is built around keeping everything in a single Word document, so that only one person can work on on a manuscript at a time
Source: Using Microsoft Word with git