I would imagine that couples therapy would be hard. I think that the notion is that it is less about one partner criticising the other (and vice versa) and more about one partner telling the other what is going on for them with respect to their thoughts and feelings (and vice versa). So... It is meant to help with increasing intimacy by sharing rather than decreasing it by conflict.

But I guess popular culture likes a good drama so usually there is a lot of conflict on TV depictions of couples therapy.