Agreed. That's why I constantly linked documentations and tutorials and only mention the important steps needed by an openHAB user to get his/her data into Grafana. Legwork, sure - but it's important to pick the user up at the beginning, before you can amaze them with what Grafana has to offer.
Yeah I have only a few of them in mine as well. I thought it's important to emphasize, that it is possible to have the diagrams back in your sitemap, otherwise the connection to openHAB as a complete solution is not visible and an enduser might be riddled by that.