@smbrm fair enough on the info request, clarity is all anyone wants.
However, when you start talking about "ankle range of motion" and "how you have driven in the past" I call BS - zero throttle is zero throttle. If you need that (or close to it) to downshift, then go to zero throttle. It's not that hard.
The values they've used are in at least some of the car manuals as specifications. If you think
those have the wrong intentions your issue is with the manufacturers. (yes, how often those values are used unmodified in competition, and how widespread those settings actually are among all the cars, fair questions again)