As a provider, I KNOW how much more comfortable it is to talk without the client present. But guess what? Much more is accomplished if everhone is on board!

Your assumption that everyone would not be on board unless present feels paternalistic to me . And if you are more comfortable talking without the client present, again, I think this reflects more upon your concept of yourself as a provider than necessarily about your clients.

Would you mind specifying what kind of provider you are?