Does it really matter how people were seated? I doubt any of them took offense to what chair they got to sit in. It's a funeral.
For the Family, they can take some understandable liberties at the funeral. For example, place the late Queen's children (the King's siblings) ahead of the King's sons in the funeral procession although the King's sons now outrank them, but, generally, yes, royal courts tend to observe precedence in seating and that matters (regardless of whether one takes offense or not, that is not the point).
I suppose that, as the others said, there was some convoluted logic, however, to how the guests were seated. And the prime ministers of the Commonwealth realms were all seated, I guess, further behind behind the choir, indicating that they are heads of government, but not heads of state, which humbles the politicians too !
I am also glad that the presidents of republics, including the POTUS or the President of France, were given less precedence than royals and even deposed royals in the seating. That may be not very diplomatic, but it is appropriate for a monarchy to do so, at least in my opinion.
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