I agree, and I do wonder if they had no PR adviser in those early days. I've prepared clients for sitdown TV interviews many times, obvs not as high stakes or high viewing figures as H&M/Oprah but relatively high career stakes for some of them, yes. I'll always do two prep sessions and one full 'dress rehearsal'; I'll play the part of the interviewer and throw the hardest, curviest of curveball questions at them as well as the expected stuff, then we debrief. Anything that makes the client look unpleasant, tone deaf or is maybe infelicitously worded under pressure gets picked apart and re-phrased so they perform well on the day. Same if they waffle; it's important to always answer the question posed and not dodge it (as Harry just did with Sorkin in NY) If it's a pre-record you can obviously also intervene during the interview itself although I try never to do that as it pisses the journalist off and just suggests that there's an area of vulnerability for them to pick at!
I got the sense that H&M didn't go through this process before they sat down with Oprah, certainly I don't think Harry did as he was visibly startled by some of the questions, also showed visible bitterness when discussing his father which I would have ironed out because it plays truly horribly for the ordinary viewer (struggling as we then all were with lockdown). Meghan, some of the phrases she used seemed rehearsed to an extent but I think she might have devised them herself rather than done a roleplay with an adviser. A friend of mine also in PR said he reckoned Meghan had rehearsed with Oprah (at least the 'Whatttt?!' part) but Harry hadn't. I'm less sure about that.
@smilesy you make such an interesting point about their overall vibe. There's no lightness to them, no joy. William and Kate are able to exude both, I saw it at the homeless shelter recently and the carol service. They both used to be a lot more uptight but now they have loosened up and exude positivity. H&M don't have that, have never had it in any appearances I've seen. They can do earnestness, but more and more these days they exude a sense of tension and frustration. It's something they need to work on and correct in their public facing personas because, as I said on another thread, you can't sell cooking or a lifestyle brand with tension and frustration. They need to learn how to appear to be joyful.