I find this quote highly interesting. Especially point two:

Mullenweg identified a few questions he sees as “good measures of success for Gutenberg:”

Are people, when given the choice, choosing to use it over the old editor?
Can they create things they weren’t able to create before?

...

I'm a big GB fan, but it makes my stomach ache.

GB is so slow that it is completely useless for me as an author. Why? Because I can't write! Is that too much to ask? I don't think so.

Before 5.0 is published you should at least be able to write.

Details here: https://github.com/WordPress/gutenberg/issues/11782

What disappoints me? It seems as if one does not pay much attention to it...

Fact is: I cannot write extensive texts. A point which clearly contradicts and is not realizable.