Whereas with solar and wind, you need to do both, because you need the overprovisioned capacity to recharge the batteries.
But this is really a question of economics, the mix of how much storage you want to include is really a question of cost and the specific grid. One should also say that pretty much every grid already has some level of overprovisioning, because otherwise you run into problems when some exceptional events hit.
In the end why would you pay for more expensive nuclear if you can get more capacity for the same price with wind/solar. So it is cheaper to build the overprovisioning with that. Moreover if the current trends for storage prices continue then things become cheaper still.
Is it enough wind to meet all the demand at night? And what happens when it stops blowing as much as expected for a long period of time[0]? You still need baseline power generation for quite some time to come until those questions that, well, keep getting hand waved away are solved.
0: https://fortune.com/2021/09/16/the-u-k-went-all-in-on-wind-p...
The wind doesn't blow as strongly at night. It's much calmer.
Also why do you only mention solar and not wind? Maybe because eit would make your argument less convincing? The wind still blows at night, so you do not need battery storage to provide all the demand during the night.
Why are the same simplistic arguments being brought forward again and again. They have all been debunked.