12 of 44 European countries are monarchies.
At least two restored their monarchies after a period as a republic
You can list monarchies of which you disapprove, but look at the list of pariah states - plenty of republics there. And look at Russia recently. Or the 20th century history of China, or North Korea, Or Uganda under Amin, or Cuba, or the regime which replaced the monarchy in Iran
Dictatorships can be either republics or monarchies (some presidents hand on power to relatives, at whim)
What matters in the wider constitutional arrangements, rather than a glibly dismissing as anachronistic.