It is not so much about adding it to apiato (you can add it to your project, its just a package), but maintaining apidoc and openapi support at the same time (configs, generators, examples, docs).

I think its an overhead for smaller projects to use openapi, but keeping support for both will be a huge effort. Personally I think openapi has a lot of pros, especially not having node as a dependency.

I believe that in addition to Swagger being a "market standard" today, we also have the fact that the APIDocJs project is no longer being maintained as announced in October 2023 here apidoc/apidoc#1436