I see, I agree in shady areas lights are very useful, more than hi-viz. I think it makes sense if much part of your ride is in such areas, or it's overcast. The dilemma for me is, since I rarely pass dark/shady areas during day time, if I have a taillight on all the time, by the time I pass such an area, much battery charge has been wasted before the moment it's really needed, by which time the light may not be as bright as it needs to be.

My God, you almost got your second life! Definitely need a intense headlight with long beam in that case.