Dah!! 'Cos it tells you how high you are above the point you intend to land at??? Without having to do any mental gymnastics???????
Go to any shop and watch today's teenager giving you change - do they do mental arithmetic, or do they look at the screen to decide how much money to give back to you?? And who provides today's pilots?? Mr QNH, or Mr Let's Keep It Simple???
And anyway - the Americans work on QNH, so that's as good a reason as any for using QFE!!
