That's not a bad look at it either - and under those circumstances, its not surprise that born out of that time frame in Britannia the adoption of the "Neo-Byzantine" form of architecture.
Though really what those examples emphasize if the actual Imperial -if diffuse- nature of the
IoM (and how pre and early Industrial Imperial organizations tend to parallel one another in terms of organization), while the Dune universe is a parallel of Western European Feudal society, a society that isnt actually conductive to real Empire building, ala the Byzantines, Britian, or the
IoM.