First off, 48 volt systems doing regen is already taking off, and there are already many new cars doing it (not just ones that have a hybrid sticker on them eit

First off, 48 volt systems doing regen is already taking off, and there are already many new cars doing it (not just ones that have a hybrid sticker on them either: https://en.wikipedia.org/wiki/Mild_hybrid#Examples https://en.wikipedia.org/wiki/Mild_hybrid#Examples) Second, as other comment says, the idea that braking regen is going to make up for an extra half a ton of batteries is pretty laughable