Originally Posted by
MarkerInbound
It’s in the FAA AIM - “At some airports when a departure will fly an RNAV SID that begins at the runway, ATC may advise aircraft of the initial fix/waypoint on the RNAV route. The purpose of the advisory is to remind pilots to verify the correct procedure is programmed in the FMS before takeoff. “
That makes sense it being an advisory, especially for busy airports where things can go wrong quickly. Because I haven't heard similar calls at most other airports.