Now that the discussion has turned to minhag, I’ll offer my opinion on this issue.
A shul or yeshiva has the right to adhere to its minhagim. However, this adherence must be limited to a shliach tzibbur and ba’al koreh. Does anyone in his right mind think that if Rav Ovadiah Yosef were a guest in Lakewood that when given an aliyah he would make the brachos as if he were in Kovno?
In addition, this adherence should be limited to nusach, the words themselves, not the havoro, pronunciation. If the Satmar Rebbe had to daven maariv in a litvish yeshiva because he had yahrzeit, would they really make him say “nu” and not “nee”?
I know of a brilliant Ashkenazi boy with yiras shamayim and excellent midos who applied to a Litvish Yeshiva. His crime? He davens with a “tuh” and not a “suh”, that is, he davens havarah sefaradit. They were eager to accept him, but informed him that he would never be shliach tzibbur and never be given an aliyah.
In my opinion, this yeshiva should be ashamed of itself.
The all-too-common feeling that “Retzon Hashem is defined by what I do” is repugnant.