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I’m not sure if I saw it in the same place, but I saw the same recommendation long ago and have stuck with it ever since.
I don’t rely on it for changing lanes though. It absolutely helps situational awareness, but I always turn and look.
Why do you always turn and look, if the method eliminates blind spots? Worried about vampire cars?
Layers of protection. It’s worth it when we’re talking about life and death safety.