As someone observing and partaking in the process of migrating a large svn repository of word documents into confluence I can tell you that confluence's markup

As someone observing and partaking in the process of migrating a large svn repository of word documents into confluence I can tell you that confluence's markup and review functionality (even with add-ons) is a very poor substitute for word. It's still beneficial to do it for the ease of access and the improved searchability and document linking abilities, but it's definitely a trade-off where you lose while you gain.