The Rambam actually makes the same point as R’ Chaim. He was discussing how one should not go to either extreme but always take the middle path, and then he mentions that some people would go to extremes but ?? ??? ??? ???? ??? ?? ??? ?????? ??? ?????? ?????? ???? ?????? ?? ?? ???? ??? ??? ?????? ??????? ?????? ?????? ????? ????? ???????? ?????? ???? ????? ??????? ?????? ???? ?? ??? ??
And then he says that fools would copy them and gives a mashal to explain why that is foolish:
???? ???? ??? ??? ??? ?????? ?????? ???? ??????? ?? ??????? ?????? ????? ????? ???? ???? ?????? ??????? ??? ????? ??????? ??????? ?????? ?? ???? ???? ????? ???? ???? ???? ?? ???? ?????? ??????? ?? ????? ?? ??? ??????? ????? ?? ??????? ?? ?????? ?? ?????? ???? ???? ???? ??????? ?????? ?????? ???? ???? ??? ??? ?? ??? ???? ?????? ?? ??? ??? ????? ?????? ?? ???????
I.e. what is good for the sick is not good for the healthy.
I’m not saying that the Rambam would agree to R’ Chaim about mussar (though I’m also not saying that he would disagree). I’m just pointing out that he used the same analogy.