If you do lots of visual circuit work, then QFE is the way ahead; same heights regardless of where you go, so much easier!
Denham's elevation was 249ft + circuit height 750 ft = altitude 1,000ft; much easier to read that on your altimeter.
Well that works at Denham, but then it’ll be different numbers if you go elsewhere, not so if you fly QFE.
I’m sure the Reds could calculate their numerous gate altitudes for each display venue, but why would you not (as they do) simply use the datum QFE?