I am no royalist but I think I'm with [MENTION=14365]Thunder Bolt[/MENTION] on this. I'd rather have a non-elected minor herditary royal who earns a small living and does a few good turns, than elected cockwasel like Trump with full presidential powers.
There are other models, not just the American one. People always say "Would you have wanted President Thatcher or President Blair?" No of course not, but that misses the point. They would have stayed as PMs serving under, oh I dunno, President Bobby Charlton. Someone with limited but genuine constitutional powers given legitimacy by the fact they were elected to the role, not born to it.