Don't think that there are many headless CMS that has better content models than Drupal. Basically Drupal has entities, bundles, fields, all can be stored in yml configs and it can be easy extended. Could you please provide examples?
Drupal can do things, and in the hands of a developer who really knows the platform it can do things well. But I've been Drupal-adjacent for a decade and the vast majority of teams I've encountered landed on Drupal because a consultant they can no longer afford convinced them that it was the answer to all of their web publishing dreams and left them with hot mess. Especially in the civic and non-profit space the fact that Drupal powered the Obama campaign's web site kicked off a long era of cargo culting.
Is there a good resource listing/comparing the headless CMS options that are equally open and free as Drupal?