Also English people do not make up the United Kingdom. Nor do they constitute the entirety of British influence. But that's a trivial matter to a world expert such as yourself, who can't even remain consistent in a baseless rant.
The distinction between English and British in my comment was intentional. The unique style of self-infatuation expressed in the parent comment is quintessentially English (white English, to be even more precise); not Scottish, Irish, or Welsh.
And that is another fear I share for the loss of a monarchy. Something familiar and deeply associated with our long history will be gone, and home will look even more like everywhere else.
you can't possibly understand
Even if I was an outsider, why not? Everyone has deep feelings about their own country, culture, history and so on. Don't you think it's a little silly to imagine a country is simply beyond understanding by anyone else? Certainly outsiders have a different relationship insofar as they didn't grow up listening to smack of leather-wrapped balls on cricket bats or [insert distinctive national trope here], but so what? Lacking experience of other cultures never deterred the British from opining about and sometimes taking them over during the age of exploration. If anything, their ability to understand the dynamics of other countries was a major factor in becoming an imperial power in the first place.
UK system is sublime and built on subtlety and nuance
That's just a flowery way to say you like how things have always worked and have a good grasp of unwritten rules. It's equally applicable to the Catholic church or Kalahari bush society.
people who don't fully understand it underestimate it
Americans think the same thing about their Constitution, and this has a lot to do with why the country nowadays lurches from one crisis to the next, failed to anticipate the possibility of a coup attempt 2 years ago, and still hasn't got to grips with it as a polity, despite having successfully prosecuted a number of people for sedition.
I recall 10-15 years ago where when I first became convinced that the US had some serious structural problems and was headed toward acute domestic conflict, academic/legal friends would just go misty -eyed and say nice things about constitutional checks and balances and the wisdom of the founders. If had been sufficiently prescient or had a time machine to say 'by 2021 you'll have civil unrest all over the country and a mob of Donald Trump supporters will force their way into Congress to prevent the transfer of power' they would have laughed out loud or summoned an ambulance.