(The RNAV GPS LPV approach was available).
I don't think typical airliners are equipped/certified for an LPV approach, airlines don't want to invest money in hardware and/or pilot training, so I doubt they could have a GP (glide path) available to them through WAAS-GPS though apparently 777 is capable of generating its own 3 deg. glide path.
But your other points are right on the mark - it is not airport's business to anticipate poorly trained crews who can't execute simplest visual approach. If a crew accepts an approach - it means they accept responsibility to execute it.