While Gutenberg is getting better and better there is still people that will not want to use it due the the complex nature of learning a new editor. That being said we need it as a plugin with the ability to decide for our self if we want to use it or not, putting it in Core is wrong. I will give it a try and if I do not like it or my multi site users complain I will be reverting back to the version of Wordpress Before Gutenberg. Mitch