“Regarding the Nusach haGra, most people don’t follow it.”
I know, but that’s not the point. My point was that you were being critical of the changes made by the Baal Hatanya, but would be unwilling to criticize those made by the Gra.
“It clearly shows what his Mesorah was for the changes.”
It shows reasoning, not mesora. He removed the “baruch hashem l’olam amein v’amein” by maariv for halachic reasoning of not being mafsik between geula and tefilla (same reason as the Baal Hatanya). Neither of them did it because they had a long-standing mesora to do so.
It seems like poskim in Lita were just more willing to “correct” the mesora. It doesn’t seem like it has anything to do with Chassidus.
“this is how most roshei yeshiva speak when talking to non-baalei batim.”
So they’re either pretending while talking to balhabatim or while talking to students. Don’t you think it might be more likely that someone would be doing a little more acting when interacting with students than they would be when interacting with mature, working adults?