Roman Empire was a blink of an eye comprised of too few Patricians and citizens who were bought-off for cheap labor. Once the welfare State dried up, it was easy pickings because the citizens were too few and the cheap labor express could care less. Holy Roman Empire does not equal the Roman Empire btw. City-States and Balkanized realms does not make an empire.
Also, due process and Natural Rights in favor of perverted prerogative adjudication mires any form of earthly monarchy. Screw that, administrative law is bad enough, the Monarch’s court is a lot worse.
So, if the end result is the same, which one by its very nature tends to favor the civil rights and economic interests of the productive class? Because if the new boss is the same as the old boss, might one be more favorable yet?
That's the essential crux of the matter. Hereditary, culturally aligned property owners will align with the natives. Commercial, borderless corporatism will maximize whatever population power advantage they can gain.
The proof of the pudding is in the eating. We are living & breathing this very maxim right here, right now.