>> Store the power for night.
The scheme you reference in your OP doesn’t seem to be a photovoltaic system, but rather a direct-heat solar thingy.
If that’s true, then what DO you do at night? And a bigger problem, what if making steel requires several hours to raise it to melting point and then keep it molten?
It was a joke.
For me, these various alternatives are useful where and to the degree they are useful. They are not a complete solution, definitely not in the immediate future, but synergistically they can probably be part of a complete system.