A second argument against representative democracy is the bureaucratic management that blocks change and disperses accountability. Meanwhile, the benefit of a monarch is that they should care deeply and be attentive lest their head be removed.
While power can operate behind the monarch, having a singular figurehead allows for a lightning rod and scapegoat; people crave a visible leader and target, not invisible functionaries. However, the risk of notoriety (becoming the figurehead) is rewarded with perceived power converted to real power: the monarch can tyrannically dismiss the puppeteers. This should force a tremulous alliance of mutual use and disdain.
The positive and negative aspects are long-term stability and a deft reliance on appearances to simulate balance and care, something democracy attempted to circumvent and yet has increasingly embodied.