I think the thing is, once you’ve laid it all bare. Sold your thoughts and all petty indiscretions about your family, done multiple interviews bad mouthing them, it’s pretty much impossible to then immediately go and act like happy families,
harry and Meghan, but mainly harry, are perceived to have caused so much pain, from reportedly bullying staff, to accusing his family of lots of things and breaching any trust and privacy
time and words will heal, but right now it’s too early, too soon , the media focus and threads like this show it. So this solution of him coming for the ceremony alone and leaving quickly is the most elegant.
on a separate note, I think Meghan is distancing herself from the whole thing. Before spare she was surgically attached to him. They did everything as a pair. Since the book was published, he has been flying solo and the coronation is just another example of that. Which does make me wonder just how supportive she is of what he’s doing, or how aware she is of the reputational damage they are both suffering due to it .
as much as the royal family has suffered some damage from it, the real damage is to harry and Meghan themselves as most people view the behaviour as tawdry and distasteful.