IMO, Gutenberg and Page builders are two different things.

Gutenberg provides core/base level editing experience (as of now) however page builders could help in building a complete website by just drag and drop (keeping performance and security aside.)

Both have pros and cons. Sometimes I think to keep WordPress as simple and clean with less plugins but sometimes it’s quite the opposite. So much confusions. 😏

BTW, Gutenberg has been doing great for a while from blocks to the entire template libraries.

I wish both the best and the outcome would be positive for the entire WordPress community. Let’s see what the future holds up for us.