If AOA becomes actually critical to flight, and if this happens frequently, then the pilot will end up dead pretty soon
One just doesn't operate an aircraft that close to the line.
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10540 - I think you've missed the point. It's nothing to do with 'being close to any line'. A of A isn't something that 'might become critical to flight', as if it's only important if you exceed the max A of A the wing can handle without stalling.
A of A
is flight. It's all the wing knows about, the whole time it's flying. And if you're flying an aeroplane, what you are really flying is a wing. The rest of it is just there to enable the wing to do its job (tailplane etc), to give the crew somewhere to sit (fuselage), and to add energy to the equation (engine and fuel system - these latter are optional in that gliders dont have them).
That's why SA's instructor said what he did.
SSD