You are absolutely correct that it is the experience that is most important for feedback. The difference here is that when your partner says, "Clap your hands" and you do, then you actually get the feedback and the experience. If your partner only used the words, "the feedback was for you to clap your hands" or "the feedback was the sound of clapping hands" and you did nothing, then that would be what was meant by "never use words (alone) for feedback". If. for example, you decide to use tastes, your partner would choose tastes that you actually have access to and at feedback time would actually have you taste the correct one. That way, it wouldn't just be words - it would be the real experience. It is experiencing the feedback that is most important. The feedback must be something real.