THe problem is that royalists tend to use "oh the Queen has been much a good monarch/done her duty/blah blah blah" or "Lates got such nice hair oh and the kiddies are cute" or "Charles is interested in farming" for their arguments to keep the bunch of parasites
I consider myself a monarchist rather than a royalist and have no interest in the personalities. I strongly believe that the country is more stable with a monarchy and protected to some extent from extremists.
A “democratically” elected head of state would be no more representative of the majority’s wishes than our “democratically” elected governments are. There are vast swathes of us whose votes don’t count because we live in safe seats.
Now you could say “use the system used for local mayoral elections with second and third choices”. Where I live in Tory central that system ended up - to my delight - with a Labour mayor who was virtually nobody’s first choice. How I laughed.
Add to that the cost, time and financial, that it would take to unpick the constitutional aspects of monarchy, entrenched over a millennium and it quickly becomes clear that it’s far more complex than it might seem.