If b'fing, then it's maybe easier to say 'Whoops, gotta go feed the baby' than 'If my boobs don't get emptied soon I'm going to start grimacing from pain'.
How are we so sure Archie wasn't in Rome?
H&M can represent the Queen very adequately and appropriately at daytime events where grassroots initiatives are celebrated. The theme of the tour appears to be empowerment of women at ground level, and shining a spotlight on misogyny and violence against women and girls and swanking around in tiaras may not relate well to that.
Plus, South Africa hasn't always had a happy relationship with the Commonwealth. It left in 1961, when the office of Governor General was abolished, and rejoined in 1994 without reinstatement of the post. A full on black tie and evening gown tour might not be appropriate from a political pov in SA whereas it might go down well in NZ, Aus or Canada.