Wow! In your case moving to JAMstack is a great decision. I am seeing that Zeit also did that burying some of their core features - I am not so happy with that.

We have a gatsby blog on blog.graphqleditor.com. Will GraphCMS work well as a markdown editor for documents with extra props as fields or have you shifted in totally different direction?

JAMstack is the only way to go and GraphCMS makes it easy... Keep up the great work!