Scobie said that while “coronation refusals may seem frivolous”, they are also a sign of “something deeper at work”.
“Charles just doesn’t have the requisite gravitas, which is understandable, given he’s spent a majority of his life in the wake of the grand-class cruise ship of his mother’s reputation,” he said.
“In our era of celebrity obsession and pop culture icons, if Elton and Harry Styles can’t be bothered, why should we be?”
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Perry, 39, told Entertainment Tonight in April that she thought it was “so cool” to perform for the King and Queen.
Richie, 74, also told the outlet: “To be in this part of history, I’m just blown away, I’m so excited to be there. I’m walking in history.”
Swift has finished the main US and South American legs of her Eras Tour, which is on track to gross more than $1bn (£791m) by its final show in December 2024.
The film version of the tour became the most successful concert film ever before its release and has grossed more than $250m (£198m) worldwide.
Sky News has contacted Buckingham Palace and Swift’s representatives for comment.