some parts oft he world get cold at night.
And electricity is NOT the most efficient form of heating. Natural gas is VASTLY less expensive in the US, and most parts of the world have some fossil fuel that's cheaper to burn for heat than electricity is. After all, conversion of any fossil fuel to electricity is only maybe 60% efficient, while condensing boilers can get 97% thermal efficiency.
Of course, even better is just having homeowners install solar home heating systems, as they can thermally store solar energy, and release it into the home at a later time. Such systems are vastly more efficient, and vastly cheaper, than PV panels, anyhow.
And as for your "you can waste all you want from wind and solar" premise, that's just sheer lunacy. No resource is infinite.
Solar is pretty close to infinite, and wind in specific locales also is practically unlimited. The only question is whether or not the amount of energy you're extracting from your solar or wind installation makes up for the up-front cost. If so, not utilizing ALL the output is only a very minor loss. And dumping a lot more money into the system up-front, in order to "use" that power (but at a financial loss) makes NO SENSE at all.