I think my opinion is that this is all Harry's fault.
I think he rushed into marriage without truly preparing Meghan for what to expect. Chelsy and Cressida both walked away because they knew they couldn't handle the pressure - so he should have made damn sure that Meghan knew what she was signing up for.
He was the head of a mental health charity and had been open about having therapy, so why the hell, when his pregnant wife told him she felt suicidal did he not seek help for her? He openly admitted his response was to tell her to put on a posh frock and take her to the theatre. What a shitty husband.
For someone who had grown up in another country, was hugely independent and a hard worker, and had strong opinions, it was always going to be a monumental culture shock for her to discovered that she was never going to be allowed an opinion on anything, ever again. That's an absolute mind fuck, so I really truly don't blame her for freaking out and wanting to go back to some resemblance of normality.
However.
I genuinely believe that the pair of them could have easily walked away with a lifestyle similar to the York sisters, whereby they could live their own lives, yet still honour the family where needed.
But the way that they left - the petulant "service is for everyone" remark, the comment about how they could use the word 'royal' outside of the UK, announcing their departure before the details had been ironed out, moaning about having to give it a year's trial, then the Oprah interview and suing the UK government...that's where they went wrong. To me, they didn't just burn their bridges, they threw a fucking Molotov cocktail at the bridge.
I think that Harry has never heard the word 'no' in his life. Therefore, he was genuinely stunned that he couldn't get what he wanted, hence the constant hissy fits. Its a real shame that he's burnt his bridges so badly that him and his family cant participate in things with the rest of the wider family - e.g. the party at the palace and the parade with everyone else. That would have been lovely to see a real bonding moment there and to be honest, I can't see how they will ever resolve it.