@CokeDrinker
DeRigueurMortis The comparison is not with Trump, it is with Boris Johnson.
For the purposes of these threads we are discussing the monarchy's role as Head of State/Armed Forces etc. We often have US posters saying the "Queen of England" and monarchy outdated. That's the reason the US political system crops up and it makes the point that those in glass houses etc. so it is the Queen, not the UK Prime Minister that is compared to Trump for those particular roles.
We don't generally have posters coming on from Iceland etc telling us we're a shambles and should run our country the same way they do, so that's why we're not discussing their system of electing "deserving" people to the role of president ie. what the UK republicans would like.
In contrast, we do have US posters regularly popping on to say "British people" are a laughing stock and monarchy outdated etc - that's why the conversation turns to Presidential system. I wouldn't go on to US chat boards and tell them about other systems round the world because their one is a laughing stock.
In the UK the armed forces swear allegiance to Queen and heirs etc ie. a backdrop of non-changing stability behind politics. In the US they swear allegiance to the President (and their country) and an ever changing political view. The RF are representative embodiment of the UK (brand).
To have an ever changing President in the UK - we'd have self-declared "worthy" people vying for the position (self glory ultimately).
The division of sides created as to who should win/should have won etc. Also the experience gained in how to behave in a diplomatic way with people you don't like or agree with, would be lost rather than passed on from generation to generation on how to adapt and reflect the UK population).
President will have known political views in their past - that makes representing their country more difficult on a world stage.
Trump coming to BP - the Queen was as gracious as ever - to have been rude to him would have been being rude to the US population - whether or not they like Trump, he represented US abroad.