I’d add that it DOES regen even while you depress the brake pedal, as indicated on the screen. This starts to happen as soon as you lift your foot off the accelerator, so it’s actually blending two means of deceleration, but in a much simpler way than a Prius does.
As a two time Prius owner, I really didn’t think highly of this until I tried it. After 3 days with my Model 3, I now believe Tesla’s system is superior because it’s simpler, safer and even more comfortable to drive!