PKP’s Alec Smecher, with a great layman’s-terms overview of JATS XML:
While it has been hard for publishers with limited resources to adopt, and there is an exclusionary aspect to that, JATS has forced scholars to consider what scholarly documents are made out of, how we produce them through processes like peer review, and how we describe them. In that sense, JATS is a tremendous piece of meta-science. It is often at the center of the scholarly publishing ecosystem pushing for improvement.