Captain Bloggs:
The latest ICAO concept that has reached us, 2D and 3D approaches, has NPAs that are flown with an FMS-derived approach path may be classed as a 3D ie "precision" approach. It won't have a DA, so it's up to the operator to not go below the MDA.
Be that as it may be, FAA flight inspection is continuing to remove or not accept VDAs on many NPAs in the U.S. If the runway doesn't have an APV there are obstacle issues in the visual segment. If flight inspection judges them significant the VDA is removed (or disapproved on new NPAs, such as LP and LNAV), thus there will be no vertical path such NPAs in the FMS.