How so? Can you name and show a design which works consistently and in all scenarios when that far outside of the envelope? Bet you can't.
I don't need to, Dozy, nor did I ever say there was one. Some bright spark thought that aeroplanes couldn't fly below 60KIAS so decided that they'd turn the stall warning off below that. Bad decision. If the aeroplane's in the air and below stall speed/above stall AoA, keep the stall warning on! Why is that concept so hard for you to grasp?
It's obvious what BOAC meant.