[mherchel]

Keep in mind that many FOSS CMS's can also do headless. Drupal has very robust JSON:API support (as well as GraphQL through a contrib module), and WP has its own Rest API. Drupal also has a distribution specifically geared toward headless/decoupled: https://www.contentacms.org

[celticmusic]

There have always been headless CMS's, the flavor of CMS that really means "web CMS" has always been a single category of CMS.

What this article is really saying is that the web CMS is going away, leaving content CMS's with web API's as the king. What you're saying is that Web CMS's are morphing into content CMS's.

Which is great, but I don't really see the point of the article. None of this is really new.