Earlier quoted context omitted.
As many others indicated, static sites are much better unless you need dynamic features. Static sites make deployments much easier, doesn't depend on any OS/runtime, doesn't lock you in to a particular database. You just write markdown and with little to no modification, the same thing could just work on Hugo, or Jekyll.
I use Jekyll; I used Hugo and Pelican in the past. They solve a very specific use case. But if you want to allow guest posting on your blog, a static site will not do. You need something that has drafts, that has a proper editor, that has a UI you can add and invite people to. Ghost solves that.
It seems that all of those features are Git-features. The missing piece is a "git-aware" markdown editor, as in, an editor that knows about git branches, and can commit/push and be mildy helpful if there's a conflict.