I see Gutenberg as a boon to the competition. It's proof that WP has lost it's way and will open the door for folks to look at alternatives with stronger product road maps.

As a manager, I'm faced with an as yet unknown block of unscheduled work this year to implement a feature that I'd have a hard time explaining to my end users and my boss as an improvement.

It's going to leave a very bad taste and may drive future projects to other solutions. That could Wix or Squarespace but more likely, in my industry, Sitecore, Drupal or TYPO3.