I don’t know how you will address the 3/ roadmap. Do you mean a list of what is missing or immature in the OCaml ecosystem ?
Exactly, the main idea here is to make visible contribution opportunities on existing projects and also opportunities for new projects that people would like to see happen.
For example, in the GitHub PR, @edwin referenced the feature grid for HTTP clients in Simple, modern HTTP client library? - #14 by edwin (@antron let us know that hyper plans to address this gap - Thanks! 
). When I see a feature grid like that, I get a better idea of whether a given package is suitable for my usecase and I also can see the potential for improving the existing packages.
I am sure we have a lot more of these kinds of discussions and lists all over the web and on this Discuss forum. If we can tie these loose ends together, we get a high-level view of the OCaml ecosystem’s maturity.