This argument has gone on for as long as I can remember. to the extent its almost pointless. I would hope that anyone performing low level aerobatics will have it firmly implanted in their minds the altitudes or heights that must be achieved both at the top and at the bottom of a manoeuvre. The QNH pilot listens in a wonder of disbelief that anyone would mess around with the altimeter at critical moments (resetting to QFE). Knowing the elevations is part of everyday flying for QNH pilots. The only rule that I demand is that you fly one or the other and then use it at all times, but never mix it. If an a/g operator refuses to pass the QFE or other wise QNH ( a FISO or ATC will never refuse) this will require a very stern chat with the fool after landing such that he/she will never refuse to do so again.
In the majority of countries throughout the world QNH is the norm.