Princess Beatrice and Princess Eugenie have been told to stay out of the limelight, with claims that the "public doesn't want" the sisters working on behalf of the Royal Family.
King Charles had stated his intention to create a "slimmed-down monarchy" before his reign officially started.
He wanted to reduce the large number of extended royals that frequently appeared on the balcony of Buckingham Palace and instead put the working royals front and centre.
As a result, the Royal Family is now quite thin, with just the King and Queen, the Prince and Princess of Wales, the Duke and Duchess of Edinburgh, the Princess Royal, and older royal cousins remaining to support them after the departures of Prince Andrew, Prince Harry, and Meghan Markle.
Beatrice and Eugenie's husbands are 'wealthy' according to Bond
However, royal specialist Jennie Bond outlined why she believes it would be a mistake for King Charles to abandon his "slimmed down monarchy".
She said: "I think it would be a backwards step for King Charles to change his ideas about a slimmed-down monarchy.
"It’s true that the number of working royals has reduced naturally, because of Andrew, Harry and Meghan and, as the Princess Royal acknowledged, they are now pretty thin on the ground, but I think the King’s concept of a small, efficient core of working royals is in tune with public opinion.
Bond thinks King Charles should stick with the slimmed-down monarchy idea
"Beatrice and Eugenie already have a voice by dint of the royal status and both carry out charitable work when they can.
"They both have wealthy husbands and I do not think that paying them to attend events would go down well with the public.
"If they want to carry out more engagements, then I’m sure the King has more than enough private wealth to thank them for their time."
The commentator also told OK!: "The same goes for Lady Louise Windsor, and I don’t think a royal role for her has ever been part of the game plan.
Princess Beatrice and Princess Eugenie at the Platinum Jubilee