Nuclear reactors have very difficult engineering problems unknown in most other technologies. For a nuke, you might actually need to build a GW-scale pilot plant to discover the failure modes that show up there. Not so, most things. A bigger dam just needs more turbines. A bigger wind farm just needs more wind turbines. A bigger solar farm just needs more panels. A bigger ammonia plant just needs more catalyzer units. You can start it running after the first one, and add more at leisure.
That is a thing that makes renewables + storage so much more attractive than nukes: You are guaranteed no unpleasant surprises, and no existential disasters. That it is also radically cheaper, and starts working immediately, is icing on a very nice cake.
