> We can use storage systems to smooth out supply/demand of electricity.

They have a max capacity. They cannot be steady consumers of electricity for the 95%+ of the time that there is enough electricity to go around.

> Mining is unsufficient, because it can't provide energy in the night when the sun is not shining. Storage systems can

I can use the same argument: Storage systems are insufficient, because they can't consume most of the excess generated power to make development of more renewables economically viable. Bitcoin miners can.