You and Mercedes world or whatever have entirely the wrong concept of left foot braking when driving an automatic car. It has nothing whatsoever to do with emergency braking or reaction times or thinking distance etc.
It is just a means of controlling the speed of an automatic vehicle when maneuvering or parking at slow speed instead of the right foot possibly jumping from throttle to brake and brake to throttle with the possibility of treading on the throttle at the wrong moment leading to unwanted acceleration, panic ensuing and a possible collision.
When at normal speed, just use the right foot.
I was an authorised driving instructor and used to teach automatics and manuals.
The problem I found (in my 40s) was that when I used my left foot for braking, even at very low speeds in my company car park (I deliberately chose that to test it on a Saturday when no-one was around and I had lots of room) my left foot tended to 'stab' at the brakes, because that's the motion, essentially on/off, other than holding the biting point for moving off, that I'd use that foot for on a manual car.
The 'finesse' for your left foot is when you disengauge the clutch to find the biting point (e.g. on a hill start), not applying the clutch, and thus the same goes for the brake. To me, it's very difficult to un-learn that movement. Its the reason why computer game and aircraft joysticks and buttons are designed for specific hands - if we kept swapping over, you'd never get the correct levels of force and finesse (muscle memory) to effectively use them, because each are used in a different way.
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