Point taken. But there’s an asymmetry here: the experts at LetsEncrypt could probably come up with a general solution for OS X Server with at most an hour or two of effort. I, who have little understanding of the internal workings of OS X Server (or any other server, for that matter) would have to embark on a major research (and testing) project that would divert me from my real job for probably many hours, and the end result would (if it goes well) be a solution for ONE USER. Whose time is most productively spent?