Yours truly, A person who is learning Reason to get away from JS/TS (for code safety and improved language ergonomics)
Good question! We mention it in the video but:
We built a proof-of-concept of the Egghead transcript editor (e.g. https://eggy.netlify.com/courses/shareable-custom-hooks-in-react) in Reason because that's by far the fastest way for us to prototype and build.