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Still needs delivery system and is messy, as you well know. (I "love" your nuke map, if that word can be said to apply.) Have you not heard about the possible debut of laser weapons (illegally) from space?
The real innovation in nukes from the 1970s onward has not been warhead work, but delivery vehicles. Make your missiles more accurate or more difficult to detect or whatever, and you mix things up a lot. Hence "modernization" is all about those things. I don't know about lasers.
