Hmmm... That would be true for most of the fighting depicted in the book, but I have trouble picturing infantry going hand-to-hand against a shielded building. :P Dune is perhaps the exception to this rule, the only place in the universe where shield fighting isn't applicable. And that is why Harkonnen and Sardaukar were caught offguard against the Fremen. If they were given time to adapt, well... I would like to see close-to-the-book alternatives to shield fighting as well as shield fighting itself, which means armored warfare must be limited to a minimum. Which leaves only infantry warfare backed by air support of all kind. And some special cases, such as wormriding Fremen. Base defenses would be mostly composed of traps such as pitfalls, vinetraps, etc.