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Plug braking is a bad idea for general traffic. For short distance low speed EVs its relatively safe. All the E-lifts I used the brake pedal controlled the motor this way, there was only an e-brake for parking, not general slow downs. If I turned the key off, steering was out the window (try steering 5000lbs with a 12 inch wheel and 3:1 ratios, not easy) and braking disappeared completely. It became a rolling brick with no brakes, as the e-brake was mostly worthless on these rigs (my experience, others might maintain their equipment better).
Friction is reason things work. (I'm over-simplifying this) Friction allows us to accelerate and negatively accelerate (never like the term decelerate). Relying on magnetism for acceleration and braking shouldn't be the first and only line of defense.
Example: Maglev trains. They use magnetism for movement right? But as a backup should that fail, they have standard rollers and rails with friction brakes for emergecies.
Nothing wrong with magnetism for braking. But safety (and the law) says a friction brake that can be modulated should always be there.
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