I couldn't disagree more with this appeasing attitude. Companies have known to cut interview short when they realize the candidate is not a good fit, in the guise of not wasting everyone's time. Why can't the interviewee reciprocate when s/he has found out it's not a good fit?

Why make false lying pleasantries when honest feedback is more helpful? Even if you have blocked off the day for the interview, it would still save time on the company's part to not continue the interview.