I still think the writing was on the wall about titles at least since the Queen granted HRH/Prince(ss) to all of William's children while Kate was pregnant with George. It would have been easier to extend it to "all of the heir apparent's grandchildren" or something like that rather than specify all of William's children, but she didn't. It was a non-issue at that point because Harry was still single, but I think it reflected a deliberate decision that Harry's future kids wouldn't need (and wouldn't get) all the trappings.
For one, what if Charles predeceased his mother? Archie and Lili would never be grandchildren of monarch, hence they'd have no right for HRH Prince/ss title. Unlike William's children, who will still have the right by being the children of monarch when William ascend the throne. (Even George will still be HRH Prince without new LP).
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If we play the game with the wayback machine where the Queen was pregnant with her first child and Parliament amended The Succession to the Crown act at that time that the firstborn child would be heir apparent regardless of gender, it would be possible that King George VI issued new letters patent to establish that the Queen's firstborn's children would be titled, it would be doing so just in case her first child was Anne instead of Charles as we'd see the same situation of titles of children in the *main line of succession*.
It would be weird if Anne was born first and heir apparent to the Crown but unable to pass on titles because she's in line to be monarch but as a female, can't pass titles through the main line of succession to the Crown.
What the reality boils down to is that not only is Harry the grandson of the monarch, but he's also not in the main line of succession to the Crown. His children will be automatically HRH Prince/ss when Charles becomes king (unless something changes). As he's not in the main line of succession, the LPs issued by the Queen to update titles and styles due to the change in the Act of Succession to the Crown 2013 don't apply to Harry or his family as they're not in the main line of succession.
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Actually I think The Queen's LP is quite similar to George VI's LP when he granted HRH Prince/ss title to the then Princess Elizabeth's children. Just like William's children, her children are in the main line of succession.
Didn't matter if there's change to absolute primogeniture and Anne born first, none of Elizabeth's children would be Prince/ss as according to George V's LP, she's female line. But in any case, when she ascends the throne, her children will automatically be HRH Prince/ss as children of monarch, right?
It wouldn't be different with William's children if George were born as Georgiana. So in a scenario where Charles and William predeceased The Queen, without LP the line of succession would be Lady Georgiana, Lady Charlotte, HRH Prince Louis (and The Duke of Cambridge - and Edinburgh later), HRH Prince Harry, etc. And in the former case, if Elizabeth predeceased her father, the next in line of the succession would be Lord Charles, Lady Anne, HRH The Princess Margaret, HRH The Prince Henry, etc.
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