There is value not releasing radioactivity in the air from the natural isotopes you find in coal for example too.
There is value not having the fish or the cow you eat contaminated by waste.
There is value in not having your crops destroyed by acidic water.
There is value in having a living coral reef and not being dissolved.
I can certify there is value in all of that because I was raised in a coal extracting place. Probably you only know about the part of switching a lever on and off.
Additionally, the combined cycle power plants that allow for super efficient and cheap fossil fuel plants do not respond quickly to turning on and off; it takes time.
With solar and wind, you can choose to not generate but you can't choose to generate if the sun isn't shining. For cheap fossil fuel electricity, you need to plan out a day in advance. It's not so easy to spin a nuclear plant up and down.
Peaker plants, that are truly dispatchable, are about the cost of solar+storage on that chart these days.