the differences between asiana and ups is the difference between crawling (asiana, day visual apch, perfect wx) and running a marathon (ups, non precision, night/predawn, odd terrain and low scud).
comparing the two is like comparing the B52 to the C152. Both are planes, but not too much else in common.
being deceived at night and being deceived in the daylight is one thing.
And yes, loss of instrument discipline is a problem.
Yes. And no.
From the moment they became visual they both failed to put a fully servicable aircraft safely on the runway, and if I'm not mistaken, UPS had a PAPI to help him. It even seems they had time from the first impact to try to save the aircraft, but did nothing!
Oh, did I hit (somethin')?