I know. That's what I said. But that won't stop the media from writing stories or people from talking. That is why it does indeed matter. There is a double standard, yet the irony is often missed. While the Windsors are not really any better or more important than any other human being on this earth, they are treated as such. It is said that they should be thought of as normal, but they aren't. Not because of anything they have done, but because of the affirmation they receive from the public, which includes this very forum.
Her background matters to the public. Enough for Harry to care? Obviously not and good for him. But that doesn't stop the double standard from existing. The family cares because perception matters. Perception is the only reason why they exist.
Meghan looks like a pretty normal girl from the sound of things. Her family has some interesting characters as all of our families do. And that's not a bad thing. It just is what it is. I can, however, understand why someone who believes in the monarchy would find her presence to be problematic. It erodes the illusion.
Personally, I don't care because I don't believe in the illusion myself. I don't believe that Meghan has to be perfect or anything close to it because Harry isn't either. He seems so very ordinary. The only thing that makes him special is the fact that he is a prince. That's not his fault, of course, but it's the truth. No one would pay him any mind if he weren't one.
So while I don't buy into making stories about her family a big deal, I still play the Devils advocate and try to think of how a traditional monarchist would think. And from that perspective, I think they do matter. People have expectations of Harry's wife, girlfriend, or whatever else because rightly, or wrongly, they have expectations of him.