Another accident that didn't need to happen
It is similar to scores of other earlier accidents of the past few years, globally, of the same generic profile, that didn't need to happen. A Citation X could have already been using RNP (as nearly all current production large jet transport airliners already have access to), which could have easily provided a safe path and an excellent instrument approach to both runway ends at EDFE, to minima of 200' HAT or below (if the science and policies are properly applied). And it wouldn't have needed either SBAS or LPV or APV to do it. RNP (as used by Alaska, Qantas, Westjet airlines for over a decade, and many other airlines now) could have wasily provided an entirely safe path for them use all the way to the TDZ, ....and even for safe missed approach extraction from the TDZ, had visual reference been lost below DA(H).
I fail to understand why bizav operators globally do not insist that OEMs provide the RNP capability for their new aircraft avionics, and why ANSPs do not more agressively implement the needed RNP based approach and deaprture procedures, which require NO additional ground infrastructureThis is just one more accident that didn't need to happen.