The LetsEncrypt Tab in the SSL management area, should be not visible if root so wishes this to domain owners.
The reason being, some server owners may have been selling ( affilaite ) SSL certs
If that is so, and an update is issued where all domain owners see this new free offer ...
I think you get the point.
Andreychek, pointed me here to make an issue.
I personally think it is important, I myself have been thinking off affiliating with SSL cert companies as LE, while being good, falls short at the moment in many respects.