Which is fully appropriate where it exists.
I would be 100% against the US having a 'Constitutional Monarch' but I'm 100% in support of the UK Constitutional Monarchy, given that it has come from their long established culture, nearly a 1000-year-old 'contiguous-ish' institution.
FYI in 1258 the Monarch signed documents which required him to 'Confer with Parliament' when changing rates of taxation. That's only 40 years past Magna Carta, and the first reference to 'Parliament'.
The romantic in me likes to believe the Queen would step in if the British parliament tried passing some truly terrible bill. Basically acting as a last stop gap of human and British sensibility. Though with Queen Elizabeth II gone I'd have less trust in the judgement of a monarch.
Part of me does wonder if US politics would've been much different with a ceremonial figurehead. And that'd be a fun alt-history where a great-great-grandchild of George Washington is the ceremonial head of the US government and has to deal with intrigues of Washington politics while just wanting to live quietly on the ancestral Virginian home.