Getting back on thread, it does make it harder to spot dive bombers if they are in the vicinity of the airport. The Mildura near-miss between the Embraer 190 and the GA-8 is a case in point. The GA-8 was 11,000ft at 10.5nm from the runway, diving to 1300ft at 3.5nm. That makes it very hard to pick up. If you're going to dive-bomb near the airport, make sure everybody knows about it.