Thanks for noticing our experiments and the kind words. 🙇‍♂️
(Note: I work at Automattic on the team behind these experiments)

The blocks in general are experiments in the open, trying out different ideas, pushing on what we can do with blocks and also a place to play. Blocks may start here, but then get promoted elsewhere, which is why some may not be listed in the block directory.

For example, the Image Compare block will be launching in the next version of Jetpack next week. The Layout Grid block we hope to bring to core, but need to refine more and optimize the CSS payload before introducing there. Also the Rich Image block is a just about ready to merge to the Gutenberg plugin as an experiment to iterate on there.

Thanks again for the kind article, we are excited for the possibilities with the new platform, and plan to keep iterating and exploring what can be done with Gutenberg. So hopefully much more to come.