SA's instructor said 'whatever plane you fly, pitch is everything'. Not pitch trim - which varies in importance from aeroplane to aeroplane depending on how heavy the out-of-trim forces are. But coud never be described as 'everything'. Some simple aeroplanes don't even have it, and in many others it can be ignored.
A of A is absolutely everything in flying. It's the wing that flies, and A of A is the only thing the wing cares about. Not speed (at least not until mach effects become noticable), not how overloaded the cabin is, not how hot it is, not how much 'G' you are pulling - nothing except A of A. Of course, many of these things change the A of A, but the wing knows nothing of that. All it knows is A of A.
That's why that instructor (nearly) said: "whatever aeroplane you fly, A of A is everything".
Have a read of that superb book that every pilot should read - Stick & Rudder. That explains it all, in a most understandable way.
SSD