I still think the basic conflict is that Harry and Meghan want to be "progressive cultural influencers" in the vein of, say, Michelle Obama or Angelina Jolie, and not staid old ribbon cutters as the royals are really required to be.
Completely agree with the above @WhatKatyDidNot
This sort of muddle of monarchial models is why we've just had a few pages of discussion about what exactly members of the Royal Family think being royal is versus what the public think it is.
There's been a crucial element missing in that discussion, which is how communication has changed. These days, famous people have an easy way to 'take control of the narrative': social media. Meghan aside, it's a medium that is a natural fit for Harry - informal, direct, limited to what you put out and what you choose to engage with.
There's been a lot of talk here about how Harry's position must be hard because unlike Wills, H's role is undefined. Yet the flip side of that coin is that Harry gets more freedom than Wills. And that's been represented in how he comes across versus how Wills has come across. Unlike Wills, without the weight of Will's responsibility and the expectation placed on him as people watch his move, Harry has been able to kick back a bit more, share a laugh with common folk more, to be the fun, more relatable one.
He's talked a lot not only his mother's death but her work and how she was with people. He seems to have inherited some of her natural touch and modelled himself on her. She was the People's Princess, and to a certain extent he probably sees himself - and has been seen by others - as the People's Prince.
It's highly likely that Princess Diana would have embraced Instagram wholly and enthusiastically. and down the influencer/cum charity thing. It's therefore not a surprise that he's chosen to go down that route to be in touch with the people, and that he's chosen a wife who is wily at it.
Every successful influencer on Instagram, even those with charitable aims, knows the importance of having a USP. Harry (and Meghan's) is being royal. That's why people click on his photos. There's no way he would have chosen this route if he had to give up all of his royal titles and privileges. You can't be a brand if you're not allowed to be a brand. 'Just call me Harry' only works because we all know that the unspoken end of that sentence is 'even though I'm royalty'.