We are not in the age of coal boiling water any more. Gas turbines spin up from cold very quickly. Stored hydro is also almost instant on.
Works great if you don't have to import gas from Russia. Geo-political conflicts and energy security matter which is why countries will favour power sources that allow them to minimize dependence on imports. The need for energy security will always be more important than CO2 reductions.
Furthermore, those natural gas plants need to be built along with the pipelines to supply gas. This requires a minimum number of hours of operation to make them economic. Germany has discovered that if you simply tell fossil fuel plants that they must pay the cost of renewables they will close and the system will collapse. So now Germany has to subsidize fossil fuel plants because they cannot afford to let them dissappear.