Project Gutenberg was the project to evolve WordPress to allow for editing that was more structured with elements you can drag into place.
Looking at the commentary on the internet it is not liked by a lot of the WordPress community. I personally found it slow and cumbersome.
In my estimation, there is a plugin that addresses the same issues but is far better. That is Elementor. Based on the very large number of installs and very high rankings by users, I would say I am not alone.