Paragraphs is how Drupal sites get component-based page building, and the gap between what it does out of the box and what a design system needs is where most agencies write private code and keep it.
This one went back. J. Hogue took the module through Talking Drupal in October 2018, and it sits on Drupal.org for anyone to use.
Via Talking Drupal and Drupal.org.