After inquiry from a custom about users & groups' repository implementation, dev team was questioned and their feedback was that the implementation is not production-ready.
It is necessary to mention in the documentation that it is not production-ready so that customers are not misguided.
In section Storage Options for Users and Groups, add a note to state that A Nuxeo Platform repository implementation (Users and Groups are then "documents") is not production-ready (for all current and past LTS releases).