Don't get me wrong, I actually like building in Gutenberg and have done a few Gutenberg projects (using ACF Blocks [1]). But convincing clients/users to migrate from third-party builder that has locked-in content with advanced features like columns, modals, show/hide content, responsive show/hide controls, animation, effects, and a whole host of other various bells and whistles was just a nonstarter. They'd pay in man hours the same as they would for an entirely new, custom built site. And that was for every site.
[1] https://www.advancedcustomfields.com/blog/acf-5-8-introducin...