It requires building new factories and retooling them to build the right stuff, and it requires manufacturing and packaging, and safety - which requires more money.
The initial investment is in the Trillions, no one is going to do that when the states get uppity about you having a hydrogen bomb in your car.
But the science for the tech and industry is there. Behind a Jstor paywall.
Low power stuff is popular in the cutting edge electronics field because smart bombs that require tiny fuel cells, or can just run off the rocket motor already powering the missile are woke. And don't require big dangerous amounts of power coupled to them. And are also lighter.
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