That word "detached" would bother me too. I prefer to think that Ts have to maintain emotional distance, not detachment. Distance implies that they are attached and connecting emotionally on some level, but that they may need to take a step backwards in order to offer a healthy, objective viewpoint.

Almost like an elastic cord between the T and client...you're connected, but not enmeshed, and the distance can vary depending on the material you're covering.