“I think Gutenberg has a chance to become a cross-CMS standard, giving users a familiar interface any place they currently have a rich text box.”

I can fully agree with that, as I’ve been thinking about it too since when I read about the Gutenberg fork for Drupal (which was a few years back).

I believe that we often lose focus comparing Gutenberg with page builders, when its potential goes way beyond that.

Personally, I like Gutenberg because it allowed me to start thinking out of the box in solving problems that up until now seemed to have very limited ways to deal with. Having that freedom outside WordPress would be a very interesting perspective.