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I'm not sure what you mean? You need to get up the hill to get down the hill, but today when I do that the energy downhill gets wasted through heating of my brakes at the bottom. If I could use that energy for easier time the next hill around that'd be really nice.

>The whole "pedaling to load the battery" is both inefficient (you'll lose north of 70% of energy on the most efficient bike dynamos) and less reliable than having a direct link between your pedals and the wheel

Can't you still run it downhill and regain energy? A lot of downhills in the city can't utilize the gravity all the way, instead having red lights just at the bottom of the hill