[Recurecur]

Night isn't the only source of solar intermittency, overcast also has a large effect. Solar also isn't cost effective at higher latitudes. When people are freezing to death, your simplistic approaches won't appeal much.

Efficiency is great and should be encouraged. We still need increasing amounts of reliable, plentiful and cheap energy going forward. You may be willing to accept a diminishing standard of living, most are not.