Luke can always add a USB-to-SATA IC in the MEB, and the MEB will have SATA.
FWIW, for my own use (mostly low-power servers, running 24/7), SATA-via-USB is a non-starter because my experience has always been that these are not nearly as reliable as true SATA. Second problem is the usual poor support for things like S.M.A.R.T or control of spin-down-when-idle. For my use case the performance difference has never been a show-stopper (after all, I lived with a wl-700ge as one of those servers until fairly recently), but of course in many cases it can be yet another deal-breaker.
Stefan