If Gutenberg isn't an improvement for you with regard to client sites, then you're not actually developing your client sites correctly per the WordPress specs. You're relying on builders to do too much of the work for you.
"correctly per the WordPress specs" - this is like windows rolling out an update that breaks atom, sublime text, and others that were working well. Seriously.
We don't rely on page builders on 100 out of 120 sites. Some sites do have custom themes that incorporated rows for design, which may break with this update.
The sites that did rely on page builders were working great and had no need for Guten.