Jack,
NPAs are a threat. They increase pilot workload significantly. I can fly them but I'd rather fly an ILS - much easier.
400 odd people down the back want my life as easy as possible so I can focus my attention as widely as possible - not just the approach.
SYD 16R G/P was out over the weekend. Frankly, it was a s$&tfight. No-one's fault, just greater seperation, a few missed approaches in crappy, windy weather and a NPA. Busy, threat rich environment. Ripe for errors and an incident along the lines of the one that we're discussing now.