As you said, you clearly haven't studied braking in a Tesla at all. That discussion is entirely appropriate to the blended brakes most of the EV market uses. Tesla has continuously refused to contemplate blended brakes, largely due to pedal feel/response as I understand it. Thus, with iBooster, Tesla has the most direct brake response possible - the pedal is pushing directly on the master cylinder piston just like an unpowered hydraulic brake system, and the iBooster adds braking force when the car feels it is appropriate. Electric braking happens solely by the release of the accelerator.