I'm honestly curious as to why you feel Remick was wrong for Phyllis. Do you feel she's not cold enough for the character? I found her interpretation quite valid, and rather refreshing that she didn't play the role quite so caustic as some others. (Of course, the elimination of most of the show's dialogue in that concert had a major effect on that as well.)
As far as I'm concerned, the only aspect of her performance that was slightly disappointing was that I wish her singing voice were just a bit stronger, but there were only a one or two moments in the show (or, rather, on the recording) where I really felt that.