My post which has received comment was merely to point out a PIC's responsibilities, not intimating anything specific to the accident, other than even under positive control the controller is not responsible for the ultimate safety of an aircraft. In some jurisdictions a GCA is not now permitted, other than in an emergency, because it's not a pilot interpreted aid, although it was standard airline fare in the piston days.
Except that for an aircraft under radar vectors the controller is responsible for ensuring terrain and obstacle clearance. Mistakes may happen and you might be forgotten about so it's still good to be alert after being given a vector, but if a controller uses the standard phraseology "radar vectors", this indicates they take over responsibility for your terrain/obstacle clearance.
Beg to differ, ultimate responsibility rests in the cockpit, always, it behooves the cockpit to understand where the controller is directing them, accidents have happened where aircraft have hit terrain while under radar control. Controllers are human and make mistakes. We've had such systems as TAWS and TCAS introduced to provide protection against the unthinkable.
https://www.skybrary.aero/index.php/...ced_Situations