It is all okay by me.
I have to conclude that, for so far, I have been the only one who can refer to official documents and to the standing practice in which Máxima, as wife to the Prince of Orange, is not addressed as 'The Princess of Orange'.
Food for thought: this is also a break of tradition as all previous spouses to a Prince of Orange:
Sophie von Württemberg,
Anna Paulovna of Russia,
Wilhelmina von Preussen (1),
Wilhelmina von Preussen (2),
Anne of Great-Britain and Hannover,
Marie-Luise von Hessen-Kassel,
Mary of York,
Mary the Princess Royal,
Amalia von Solms Braunfels,
Eleonore de Bourbon,
Louise de Coligny,
Charlotte de Bourbon,
Anna von Sachsen,
Anna van Egmont
Anne de Lorraine et Bar
were all Princess of Orange, being a spouse of the Prince of Orange.
Máxima is not.
The first one in all those centuries.
Food for thought, myladies and gentlemen.
I fail to see why this breach with tradition (and there were lots of protests as well) is ignored if we are talking about a possible future breach with tradition which is already mentioned in the Act on the membership of the Royal House. Like it is already mentioned in the same Act that the Heir(ess) exclusively bears the title The Prince (Princess) of Orange.