I'm persuaded by the “I know when I've crashed” and the “punitive scenery crash box” arguments. I'm less persuaded, however, by the “FS crash detection is unrealistic” argument. It is, after all, a computer game (oh dear, I'm in trouble now), and games must have rules. I've had CD on forever, and landed pretty hard without FS telling me I crashed, even helicopters on ships. If you're getting “FS crashes” when landing at perfectly good runways (or ships) without mysterious scenery “crash boxes” intervening, then, well, might I suggest you need to land more softly... 
