How much science fiction was inspired by John Carter of Mars? I know he inspired Superman.
The Burroughs stories featured Space Feudalism as well.
But they did heavily influence and help form the genres they're part of.
Lord of the Rings, for example, while based on existing sources (e.g. folklore, Christian and Scandinavian mythology, et cetera), basically helped form all the tropes we know today in even long-standing franchises like Dungeons and Dragons (which in itself helped form other tropes/franchises).
It's the way of the world in creativity, though copying is not good, being inspired by is the bread and butter.
I'm not saying Battletech wasn't inspired by Dune (maybe it was in this respect) but Space Feudalism Noble Houses seems more broad to me inspiration wise then say, Mutant Space Navigators.