Right, I think I just possibly begin to see....
If you use QFE you have to remember whether you've got the QNH set or the QFE. Now that's just hellishly confusing, innit?
But wait! If you DON'T use QFE, you have to remember how high the airfield is, and take that into account when landing. Awwwww, now I don't think I could cope with that.
Isn't it just awful! You've either got to cope with TWO (a HUGE number) different altimeter settings, or you've got to add and subtract a few hundred feet at every airfield. Those are really, really complicated things to do. And to make it even more confusing, you have a CHOICE of which to do, since no-one has ever held a gun to a pilot's head and demanded he do one or the other. So you have to decide for yourself!!!
I feel quite exhausted with working all this out, and comparing the strong views for and against each method. I just can't imagine how I've flown in both the UK and other countries for all these years and managed to cope. I would have thought it would give any poor pilot a nervous breakdown, just thinking about it.
Come to think of it, I need a drink.......