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Even vehicles that use regen for braking (like Tesla) still have mechanical brakes for emergency stopping. Elaphe has said that their in-wheel motors have the ability to replace mechanical brakes but, so far, no one has seen it happen.
I rather like “blended braking” in which the brake pedal serves in a manner similar to the “full regen” paddle on the Volt and Bolt: Release the accelerator and the vehicle regens, apply pressure to the brake pedal and the amount of regen increases, apply more pressure and the mechanical brakes engage to bring the vehicle to a full stop. Honda has this form of braking nailed: It’s seamless and functions without any feeling of “mushiness” or “jerking”.