Git is useful for code, not specifically because it handles change over time, but because it’s possible to reproduce the exact state of code at a given point in time and to allow multiple concurrent editors.
People use it for files and such, and maybe there’s a use case for files that are collaborative, but it’s rare to have six people simultaneously working on a single document.
If you just need version history, so that you can go back to previous document states, then macOS has this built in so long as your app supports it. Pages et al do.
If you want to communally edit documents, then iWork and Google have solutions for this, some are better at concurrency than others, but they’re more appropriate than trying to use Git.
If your need a common point for sharing documents, then MS Sharepoint, or Dropbox, or just sharing documents by iCloud (built in to Pages yet again) are entirely adequate.
So really, in my opinion, Git is suitable for software, and using it for other things is fitting a solution to a problem rather than solving a problem with a solution.