Actually I agree with you, if there was some good story behind this, it would have made spare.
i think for lilli, the sad truth is this would have been lovely if this was something agreed with the queen in a good relationship .
But knowing that her parents were estranged from thr royal family, at the time of her birth, and the queen clearly not happy with their behaviour and desire to monetise their titles , it was her who made them stop the trademarking and shut down Sussex royal , rejected the half in half out after they embarrassingly made the statement on collaboration with her, and put out the withering “recollections may vary” comment, then it looks like Harry and Megan were using their daughter to benefit them, build bridges. Boost the brand. And were not thinking of lilli when they did it.