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> Because you can't choose when the sun shines and when the wind blows.

This is a terrible argument. There is always some place on the grid where the wind is blowing and (during the day) the sun is shining.

That's far from guaranteed. It's very possible to have little wind over a large area, larger than France even, during the night.

And the same for solar. There are several hours every day when the sun is shining nowhere on (Metropolitan) France.

Especially during the night :)

Do you have any actual numbers to back these claims up?

Yes, at Europe scale: https://youtu.be/1aCHN6dytVY in French

This has been demonstrated to be false, unfortunately. See https://youtu.be/1aCHN6dytVY (in french though)