Wow, sorry to hear about the bad blended brakes on Leaf and Prius.
However, Volt (Gen 2) Blended Braking has been a revelation,
it works perfectly.
Having the latest gen 911, I know what great brakes feel like and Blended Brakes are excellent when done correctly.
Tesla only gives 60kW of regen off-throttle.
Seems like more regen is possible, but its too hard to control more regen single pedal.
Why not give 100+ kW regen on the brake pedal?
Seems low-tech for the Tesla brake pedal to be Friction Only.
Off-throttle regen vs Coasting could be a user choice (like it is in Volt).
If you ask me, I bet Auto Pilot is so popular on Tesla, because of Single Pedal Throttle Control being tiresome.