I think the power requirements for those kind of things might keep their maximum effective size down to at least what could be mounted an an armored vehicle. There are advantages.Hard to outrun a beam of light, and using beam weapons for anti-missile technology might eventually become so effective that modern missiles go the way of the Congreve rocket.Also note how these are early proto-types. They're going to look way different in the future. Less parts, probably less matter and more energy.
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