DaMoshe:
To be fair, the Gra also made changes to minhagim, nusach, and zmanim. On those specific issues, [non-Chabad] chassidim end up keeping the old Ashkenazi mesora better than most Litvishers.
I agree with parts of what you’re saying, but focusing on nusach changes made by the Baal Hatanya is kind of throwing stones in a glass house.