Why do Chassidim have a different pronounciation than Sefardim? Than Yekkes? Than Temanim?
Accents change. Pronunciations change. If it didn’t, we would ALL speak exactly the same.
I grew up with the term aufruf (pronounced OW-fruf, as is the proper german pronounciation). If I say aufruf (OW-fruf) to most people they have no clue what I am saying. So I say ufruf.
I changed my nusach in tefila. My Rav said that was ok. Why would pronounciation be worse?