In reply to Justin Tadlock.

Thank you very much for your comforting answer.

I want to go deep with the second part: "Gutenberg is much larger than just the editor"...
I have ever seen a plan for it. I would like to see a Global Plan beforehand people start coding.

Large engineering projects are started that way, first a global plan, then some local or detail plans, every specified before anyone starts coding. Were are we going?

I have the impression that in this case, nobody did this plan and people starting coding right away. I have seen block plugins come and go...