I don't see Harry and Meghan over stepping their role. Only the press thinks they want to be at the same level as the future king
At the moment they are. They are the grandkids of the queen, William is not heir.
The UK is not comparable to other countries. Unlike many of the continental royals, where younger siblings are almost private citizens, its different in the UK. Harry and Meghan are not going to be private citizens, they aren't going to be in the shadows, as quiet supporters. That isn't how the BRF works. They are in the same role as Andrew and Fergie were in back in the day. Until George and his siblings are old enough to take on duties, Harry and Meghan will play a significant role in events and charities. Both Harry and Meghan are carving out their own role in the family and the works. As the only other child of the future king, Harry has a high profile. That is something the press seems to ignore.
As for the idea of Harry marrying a 'country bride'
Harry is in his 30's. He is in the same boat his bachelor father was. If he wanted a woman who had no history/baggage, he was going to have to go young. Do we want another child bride? There is no woman in her 30's who is not going to have some dating baggage. Nor who (well hopefully) will not have some kind of career and views of her own that she brings to the package. Just as bad as a 19 year old virgin bride for Harry, would have been a 30 year old socialite who had never worked or done anything in life. Harry needed a woman who was sensible with a good head on her shoulders. He found that in a woman like Meghan.
It seems people have short memories. The Middletons certainly caused their own stir. Stories about party pieces cashing in on the royal wedding. On James using royal covers of magazines to promote his cake business. The Uncle who you could write a book about. Even perfect country rose Kate has a family who has been tabloid fodder for years. The Spencers most certainly have been as well. Sophie's family and Camilla's were the exceptions. Then again Camilla was enough of a tabloid fodder without going into her family. Annabel Shand-Elliot has got some spotlight but mainly as she was hired by Charles to decorate his estates.
Charles is the perfect example that the 'perfect marriage on paper' is not so ideal. He has had two marriages, one that was a disaster nearly from the start, and one which has worked out great. It was the perfect marriage on paper which led to years of scandal and issue, before a horrid divorce. The woman he wasn't allowed to marry, ended up being his perfect consort. And in reality Camilla is that. Diana was too much of a star, she shone too much on her own. She was never going to be the supportive consort. Camilla is.
Its sad that a woman with a work ethic is considered pushy. That she doesn't want to take a few years to ease into charities, and wants to work hard from the start, is seen as over stepping boundaries.