I applaud Menachem on being rational about the Tzemach Tzedek re his views on beards. A great tzaddik and gaon, but nontheless not a daas rabbim, as Menachem wrote.
On the other hand, Menachem also wrote the following: “it is wrong when people play two sides on which rabbanim they use. Some people might accept Rav Shach as daas Torah who must be followed by all of klal Yisroel in regard to Chabad… yet when it comes to beards they are meikel like Reb Moshe …”
If people do the above because it suits them, then it is certainly not laudable, but it is still not definitely wrong. See Eiruvin 7a where the gemoro only says it is absolutely wrong if the chumra and the kula contradict each other.