If you give professional chef an elaborate dish and the recipe for it, will they be able to make exactly the same thing?
But can the original chef that wrote the recipe produce the same thing several million or billion times a year?
That’s the thing with the chefs - you can’t make a mammoth dish because there are no more mammoth to cook.
In the nuclear weapons case we deliberately dismantled it.
I'd say that is actually a good thing. Nukes are meant not to be used. They are a deterrent, so it's important they exist, that they are functional, and that you are willing to use them to hit hard against an aggressor. MAD kept us alive until now.