OK, but is not late better than never? All the new users of WP, now, will have the Gutenberg experience from the start, for free, possible minimizing the need to look for third parties plugins.

Yes, the current users of third party plugin editors are tied to keep using it, or make the huge effort to ditch em (it breaks many things). But this is the risk of using any plugins for content creation is in it? Maybe a good plugin idea for the Gutenberg team is a migration tool from [plugin editor] to Gutenberg.

I think that is not too late, the popularity of third parties builders make the statement that this feature was needed, and now is moving to core, and in my opinion with superior UX/Dev teams of all the freemium third parties plugins.

The future is shining.