Exactly. Having the opposing team read out the cards prevents information transfer. Bridge has controls like this already. You aren't allowed to lie about what

Exactly. Having the opposing team read out the cards prevents information transfer. Bridge has controls like this already. You aren't allowed to lie about what your bid means, for example. If a player is confused about a bid from the player on their right, they are allowed to ask the player on the left what it means and they have to honestly answer.