Personally like the original poster I can't see the point of the "aircraft" check.
There were a few times where I started aerobatics with the fuel pump switched off. As this was in an aircraft with carbureted engine, it takes significantly longer for the engine to restore power after inverted flight. Only then did I remember that I had forgotten the whole HASELL check.
For me, the Airframe check is a quick glance round the cockpit to check whether everything is how it's supposed to be. Flaps up, carb heat off, fuel pump on, canopy closed and locked, loose objects stowed, instrument settings correct, G meter reset to 0, trim set and so forth. To a very large extent it follows the same flow as the pre-take-off checks.