Doesn't this provide an insight into whether they planned their exit all along?
I believe Harry wanted to leave before the wedding, due to the media, but felt a sense of duty to stay.
I think this applies (from the Bradby interview):
“It’s hard... ” Meghan Markle said. “In all fairness, I had no idea, which probably sounds difficult to understand, but when I first met Harry, my friends were so excited, my US friends were happy because I was happy. But my British friends, they were sure he was lovely, but they said I shouldn’t do it because ‘the British tabloids will destroy your life’.”
“Because I’m American I very naively didn’t get it. It’s complicated.”
Meghan Markle added: “I never thought that this would be easy, but I thought it would be fair and that’s the part that’s really hard to reconcile.”