Certainly interpreters that edit what a speaker says, because they feel the message is politically incorrect, religiously unacceptable, or impolite, are shielding the deaf and hearing people from one another. It's not our role to gatekeep and decide what the two groups should know about one another. It's an interesting question whether the same would hold true for things said in confidence by the hearing consumer when the deaf person is present. The conduit model has led many interpreters to try and stay out of the communication process, which of course is impossible. In trying to be professional, we may seem to be saying that we know what's best for all parties concerned.
More dialogue is needed between interpreters and deaf people about how to work as allies.
This model has been lectured on extensively by Gary Sanderson who uses the name a bit tongue in cheek. Here is a summary of my notes on one such presentation. As we grow individually as interpreters, we mirror the growth of the interpreting profession. This refers to the fact that the development of the fetus in the womb resembles the fetus of at first lower and then higher forms of life, as if evolution were happening in a microcosm. Soon we become audiophobic.