Unfortunately, this particular review tool was an internal utility at my previous employer. The only thing it could do was highlight changes in word documents.

Unfortunately, this particular review tool was an internal utility at my previous employer. The only thing it could do was highlight changes in word documents. You could compare patch sets. That's all. And it was a review tool. Git itself still treated docx files more or less like binaries. The advantage was we could use word documents instead of markdown files, usually people would embed visio diagrams inside design docs etc.