Similar problems 'exist' in women's cricket where one of the young stars dad has stated (privately but quite loudly) he travels with her, in part to protect her from the 'grooming that occurs' in the game.
Don't know how much of it is truth/rumour, but I think Aussie coaches ideas were/are fine.
I don't think partners should room together on tours. They are high pressured situations that naturally strain and challenge relationships. Adding another, more personal element to that, has the potential to go very badly.