It is a really ambitious challenge to improve on the content editing workflow of WP, however i just wonder how this whole Gutenberg story evolves. In my opinion it will be an epic fail. There are at least a dozen of other ways to improve on WP that are actually since long asked for...but no, no way will they get implemented. And here comes Gutenberg. Nobody ever asked for that again, has been hyped for months now and there are 3k sites using it...out of millions of WP sites. Maybe the idea of releasing it in 5.0 should be reconsidered as well. At least a usage statistic like that should really warn those who are responsible making the decision about merging it into core.