Correct that they don't need support from special interest groups to maintain their position, but they also dont need the support of their constituents, which means they are free to persecute or worse, do nothing at all aside from live their own life off the taxes of the citizens.
You can have a faux monarchist society like the UK where technically the figurehead is a monarch, but no actual meaningful work is done by them, but rather elected representatives, but then, thats just a roundabout way to the system we already have.
The problem with monarchy is there is no way to change the system without violence. You can say constitutional monarchy, but constitutions are hardly worth the paper they are printed on if there is a pinnical of power that keeps the military happy.
Not to mention, monarchs are beholden to keys of power and special interests, no person rules alone, so corruption i feel is no more minimized or maximised under monarchy, its just its outside any influence of the peasantry.
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