alt Hacker NewsI think their point was that a lot (but not all) of the existing argument boils down to “Well it should be that way because someone decided it hundreds of years ago” so if we are consciously starting again from scratch, ideally that specific argument no longer holds water. (I’d say we should instead use data based approaches, look at what has been successful in other countries, etc, although that’s slightly expanding the current topic.)
One big difference between the UK's historic constitutionalia and the US is that the UK generally recognises that we only do things a certain way because agreeing how to change them is too hard, while the US appears to think that they do things in their certain way because that's the right way to do them.
Specific examples for the UK: inducting politicians into the Privy Council in order to qualify them for security briefings, Henry VII powers, and ministers' authority deriving from the seal they're given by the sovereign. Which would almost make as much sense if it were a marine mammal as it does being a stamp.
The thing being, they work well enough. And if you want to replace them, you need to work out what to replace them with and how.