I think QFE appeals to the CFS old-school nibber types who like circuits to be flown at a whole number on an analogue altimeter. No ugly 46 ft etc to look at, and rounding up or down by a few feet is.... well.... imprecise! Baaaa!
Just think.... Approach plates with only one set of numbers on them and a training mindset that prepares you to fly into non-UK mil and any civilian airfield in the world. That's crazy talk!