I am quoting Dadofil form the Christening thread, because I think it bears repeating here.
If this was Carl Phillip's daughter, the child would have a monogram, a coat of arms, etc because she would be the granddaughter of a King, etc. Madeline is the daughter of the King, and as such her daughter because of the law is entitled to the same rights as her brother's children would be.
This isn't the same family that was short on heirs because people had unequal marriages or because they married someone who didn't have a title, lost theirs (a majority of the Haga Princesses), and you have an uncle who doesn't marry his love because he is waiting for his nephew to marry and have kids. The Swedish royal family is moving with the times.
Equality is just what it says folks. EQUAL.