Benevolent dictatorship is a sham. It is impossible to provide safeguards against the abuse and corruption of power than normally results from placing that much power in an individual.
Parliamentary democracy, a form of conducting affairs by mutual consultation, provides a check on power.
No. The US and Iranian system places too much power in the hands of an individual. Authority should rest with parliament, a body of many citizens, rather than in an individual.
The encumbrance that Parliament enforces on a Prime Minister is a good thing, as it ensures national consensus on actions.
It also avoids problems of policy differences and political deadlock between the head of government and the body of representatives.