The bottom line in this accident has to be how the crew handled the visual segment, at or before the MDA. Boeing wipers we know are crap. VASI/PAPI indications in heavy rain would have been visually limiting. Experience would have counted and reversion to basic skills for a successful in zone landing would then become primary functions..ie magenta dependency has to be dumped in favour for the cognitive flying skills that are the building blocks of what we do as professional aviators, irrespective of the types we fly.