In reply to Miriam Schwab.

Wordpress is large yes, but a very very very large chunk of those websites are made by hobbyists that made their own personal websites. While a headless CMS in statistics doesnt might seem as large by far. It is used in far more professional applications which are reliant on being built on a far more solid platform. Storyblok, Sanity, Contentful etc are CMS systems you find in larger projects that need the ability to scale up fairly quickly and have higher requirements in terms of security etc. Wordpress is just very easy to set up, and that is currently its saving grace. But maintaining it is a different story.

I would date to say that 80% of the wordpress websites out there are just website made by non developers.