Date: 1833
From: Rabbi Moshe Sofer
To: Rabbi Meir
Rabbi Meir raises questions about the primacy of the Sefardi nusach, the Likkutei Amarim's tribal-identity theory, sha'atnez concerns during prayer, and tallis certification. The Chasam Sofer rules all nuschaos are equally valid, rejects kabbalistic claims lacking Talmudic foundation, and counsels conformity with local Chassidic norms for communal peace.
Source: Shu"t Chasam Sofer OC §16