>most weapon systems use SoCs and microcontrollers that can be fabbed on "legacy nodes"

The argument is that existing weapons systems are essentially old tech, left over from previous wars in previous decades. Many of them are less useful in the modern battlefield, e.g. defense systems built to shoot down missiles are easily overwhelmed by drones.

If there's a real war, it will be fought with next-gen weapon systems - probably autonomous drones that will require high-end AI chips.