Maximising regenerative braking is always a goal with BEV. If there was a design tradeoff that allowed to somehow massively sacrifice efficiency for very low l

Maximising regenerative braking is always a goal with BEV. If there was a design tradeoff that allowed to somehow massively sacrifice efficiency for very low low specific mass and extreme heat tolerance, we might see the discs replaced with in-wheel "harvesting brakes" in addition to inboard high efficiency cruise motors. But #1 I doubt that kind of tradeoff exists, at least not in sufficient magnitude, and #2 it would probably be quite uneconomic to exploit, lots of lower hanging fruits to pick first.