The personal opinion of the Gutenberg lead dev on the block management thing doesn’t really matter.

What matters is that more and more users, developers included, are wanting such management features as they get overwhelmed by blocks a lot.

Also the whole dev pace of Gutenberg/ WP Core needs to slow down. It is way too fast at the moment.

If you want a to adapt another release structure and schedule have a look at Mozilla with their Firefox: they do it completely right. About 10 releases a year (with exception of christmas holiday season…). Alpha beta, final release channels. A clear release calendar. And each of the releases has a clear focus: smaller steps but consistent. — Current Gutenberg / WP Core dev is the exact opposite of that, at least to me.