> I think most should just pick the best tool for the job and stop rebuilding things that don't need to.

I think you just contradicted yourself. Sometimes the best tool for the job is something new, something improved over what already exists.

I don't think the author intends to "replace all the old working stuff". But if this tool is better for new projects, then why not? I don't get all the negativity... do people here really love XML/JSON/YAML that much? There's a whole lot to complain about in all of those!!