You did read the news this summer? Like https://edition.cnn.com/2026/08/03/europe/hungary-nuclear-pl... ?
Most of the environmentalists will tell you that it's dumb to shut down nuclear, but building new plants just takes too long and is too expensive. Why then not just put the money into things that are cheap now and will get even cheaper tomorrow?
Hedging against downtime is comparatively easy, just diversify by location and improve the grid, which is way less expensive than building out power plants.