In reply to Bill Bennett.

Technically, Gutenberg is valid HTML. It does have some JSON within HTML comments for some blocks. But, I understand what you're asking. You want to drop the HTML comments.

I'm unsure if there will be an option to export without the comments at some point. However, the conversion part would be easy from a development standpoint. The functions are already there because everything is output as HTML on the front end.

This wouldn't be necessarily Gutenberg-specific though. The same issue existed in the past with shortcodes. There may be a plugin that already exists to export without the cruft and spit out the HTML for dynamic content (some blocks are dynamic too).