Maybe I'm missing something, but it appears that the only difference between this and other static site generators is that you can edit stuff in the browser, right? I usually just edit my pages in VS Code, or any other markdown editor. Then I push to a Git repository, and my CDN (Netlify, Vercel, etc) builds the site automatically.
https://forestry.io/ removes the complexity, but keeps all of the benefits of git static hosted websites allowing non-technical people to manage static websites.
Developers wont use this, but non-technical people _might_.
ps: I have no association with forestry