In the Dune universe, when a laser weapons hits a shield, both are destroyed in a nuclear explosion reaction.
So instead of building nuclear weapons, wouldn’t it be easier to tie a timer and a “parachute” to a laser gun and drop it from orbit onto your enemy’s city?
My understanding is that such a technique is known, but the first person to do it is going to get dog piled by the other houses. MAD
Given the basic premise from the very beginning, where the emperor wants to destroy house atreides, I doubt it. If the houses were going to honor their promises, they already should have