You make it sound as if Kate had never had issues with the press. Kate and William had been together 10 years before they married. Kate had been harassed by the press, followed by a press pack shouting 'slut' and 'whore' at her just to get a reaction. Topless photos of her were published - taken not because she was dancing about topless in Ken High Street, but because some perverted pap had been lurking with a long lens a mile away from a private house where she was on holiday. Her family, especially her mother were ripped to shreds in the press.
Kate and William were incredibly popular at the time of their wedding too, but then went off to live their lives quietly for a few years, with public appearances at events like Trooping the Colour and Royal Ascot, something the Queen suggested Harry and Meghan do after they were married but which they turned down in favour if 'hitting the ground running' and look how well that turned out
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You say Kate is as interesting as cardboard. Do you mean that she doesn't shove herself into the spotlight at every opportunity to talk and be talked about? We don't really know what Kate's like - she behaves with grace and strength even when she's had the direst and the pettiest of insults thrown at her, and publically at least when faced with serious medical issues. She appears to be raising three balanced, happy children who are obviously her priority. What she doesn't do is make it all about her. I don't think it's that she's boring at all - I just think we've become so used to celebrity culture where many in the public eye spill their guts at every opportunity, create drama for column space and clicks to maintain 'relevance' and emote all over the place, so someone who doesn't seek the limelight is viewed as boring.
What's so interesting about Meghan in comparison? Is it because she once wrote a letter to Proctor and Gamble ? The number of times she's referenced this, I'm starting to think it's the most important thing she's ever done. Ironically Harry and Meghan need to generate gossip to keep themselves in the press otherwise they would just melt into obscurity. Which they really, really don't want.