I have sort of followed this conversation, but I still view the 3rd Imperium as an impersonal bureaucracy punctuated by exceptions to that rule. Exit Visa being a case in point.
I could buy it as a feudal technocracy if I could see some examples in canon. I see lots of examples of the feudal part, but I can't think of much in canon that speaks to the Imperium either treating civil administration as a science or controlling the fruits of technology. It does tend to look like an impersonal bureaucracy with nobles sitting in the power seats.
I wonder what Marc's seeing that makes it a feudal technocracy in his eyes. Maybe there's just some piece that hasn't been communicated yet.