Not surprisingly, that's because there is no regen below 6mph (may vary for RWD models) (hint: also the reason why one pedal driving isn't the trivial/artificial restriction some make it out to be.)
I wonder what the reason for that is. We do torque control on motors all of the way to zero rpm. A simple example is tension in a winding or payoff application and coming to a stop. We’ll even often use the motor for holding zero rpm instead of a mechanical brake. A mechanical brake is still present, but only used for power loss. Driven measuring rolls is another common torque control to zero rpm application. Exit tension rolls to pull through low traction systems is another.
This is what I suspect. Hydraulic brakes are needed anyway - for when higher g are needed, as backup etc. Then, at the lower speeds, on one side you need the ability to finely modulate the stopping, so the brake pedal would have to be tuned to “regen” exactly as much energy (power, rather) as the user expects. On the other side, there is an efficiency overhead to actually charging the battery, and when the braking power falls below that threshold you can’t really recuperate it - it has to be wasted as .. something (heat, in the form of a resistor). Besides, there is a benefit to constantly engaging the hydraulic brakes during daily driving. All of these together mean that it was probably easier to fine-tune blending than to make the electric motor be a user-friendly brake. And that’s just the act of stopping- holding would mean drawing from the battery enough to keep the car as a standstill, which means a lot of calculations per second to decide how much and in which direction (I imagine balancing on a unicycle would be a good analogy). It all sounds like unnecessary complexity.
Hardly worth turning on - coasting is more efficient than any regen mode.
For descents coasting has to be much more efficient -next to no friction to slow you down and therefore greater distance can be travelled without using juice - little energy added back when overrun recuperation is active, in otherwords the chances are that you'll lose more energy than you gain (all other things being equal).
Note my response was to @Jhenson29 observation about the behavior of the brake pedal/system below the regen threshold - that is, user choosing to brake.
I am the opposite!
Most EV brands including young Chinese companies can all do this, so any perceived "complexity" will hardly be beyond Porsche engineers. It's also not for "no purpose". For many (not all) it's a very relaxed way to drive. I agree it will be interesting to watch future developments across the Porsche range on this.
