Asiana accident
I was based in Hongkong during the 80's and 90's when KaiTak was considered one of the more difficult airports to carry out a visual approach. Often , including during the Typhoon season, the ILS or IGS would be switched off for "maintenance" Then it could not be switched on again until it had been flightchecked--sometimes for weeks on end. Why cannot a backup ILS be on hand to cover outages?. The Military even have portable systems to call on. Are GPS approaches now permitted ?
When on visual approaches, the only need to look inside at the instruments is to check AIRSPEED. All other parameters are covered by eye ,especially at a field with VASI's, VGPI's or any other glideslope indicaters.