I agree. What I personally would love is a WYSIWYG front end to a static site generator that uses eex or erb. If the tool is sufficiently open source and works well with some hand tweaking of generated HTML, then eex/erb isn't strictly necessary.

I'm optimistic about this though, because my suspicion is that since this tool just exports React, you could relatively easily achieve this using Next.js SSG building. As long as you aren't doing any build time or runtime dynamic data loading, by adding one more step you can use this for that, with the bonus that if complexity goes up to the point where you would want to componentize, your tool is ready for that.