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I'm not sure what you mean by "brick-and-mortar." The state-of-the-art is not "giant bombs" but "very compact weapons that you can fit a bunch of on the end of a single rocket." We developed that in the 1960s-70s. It does the job one would want very well, better than big bombs.
By the late 1970s work on weapons design in the US was, as some designers put it, "polishing a turd." Squeezing just a little more efficiency or safety out of a fundamentally solved problem. No new breakthroughs or concepts in the warhead field.
In any case your body of work for The New Yorker has been riveting...and chilling.
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