I was thinking about the tiara drama, and have come to the conclusion that there was very poor communication all round, and it wasn't entirely the Sussex's fault.
Imagine if you were marrying into a family where there was a choice of one or two tiaras that might be made available for you. MiL to be arranges for you to meet up and view the tiaras, perhaps at the bank where they are stored. After making your choice, wouldn't there then be questions about how and when the tiara would be removed from the bank, concerns about security and insurance?
The palace clearly has a well oiled system for release of valuable pieces, not just tiaras, but brooches, necklaces, earrings from wherever they are stored, presumably in some Aladdins cave vault in the depths of Buckingham Palace. The Royal jeweller presumably delivers them to the various destinations prior to some big event. Since it's mostly women who are wearing these items I suppose it's vaguely forgivable that the whole thing would be a mystery to Harry.
Why on earth was the process not explained to them after Meghan had made her choice? I would expect The Queen to head off to tea or whatever leaving them with Angela and the Court Jeweller person. Who should then have explained the process, including that tiaras aren't normally made available for hair practices but that an off the shelf tiara should be used for this purpose.
This could have been followed up with an email clearly outlining the process.
Of course there was no need for Harry to kick off and try to bully Angela. A very stupid thing to do anyway, of all the many staff I would think Angela would be the one to keep onside. I'd have been sucking up to her like crazy. A thank you note for her time helping choose the tiara wouldn't have gone amiss. Harry wouldn't think of that but a soon to be married in could be expected to.
I suspect quite a few difficult events could have been headed off by better communication beforehand. I have very little sympathy for either of them but I've come round to thinking this one was 50/50 - they should have been told how it would work in advance.