A weird thing to bring up when nuclear has the same problem. Making reactors that can respond to load is.... not cheap or trivial. And basic baseload type start out an excessive level of expense and complexity.
If you want to cycle renewables up, but can't because of limited capacity, the one simply hasn't installed enough renewables or storage.
Same answer for nuclear, if you can't turn it up enough, then you simply haven't installed enough.
Storage can help mitigate the ramping concerns about having lots of nuclear on the grid. For France to be able to have 70% of generation as nuclear, they depend on using the continents grid for balancing, in addition to having some very high priced fast damping nuclear plants. But charging storage with solar, and using that stored electricity, is cheaper than using nuclear in the first place.
And at current prices of roughly $200/MWh for nuclear, and $20/MWh for solar, you can throw away an awful lot of solar capacity before nuclear makes any sense financially. And at $160/MWh for storage, which is a levelized cost which includes charging at ~$50/MWh, there's even room to not use all the battery capacity everyday and still have a firm energy source cheaper than nuclear.
