"Do the Eastern Rites not enjoy a Unity of Faith?"
Had using the vernacular been useful in whatever evangelization that has been attempted by either Eastern-rite Catholics or Eastern Orthodox?
Has Greek Orthodoxy or Byzantine Catholicism taken the West by fire? How about the Russian Orthodox? They don't even have anyone attending in Russia.
Has Orthodoxy and Eastern Catholicism spread like wildfire throughout the world? If so, why are less than 1 percent of all Catholics of the Eastern rite?
Balkanized and segregated churches. Segregated language. Segregated Faith. It does not help in the spread of the Gospel.
No.
Balkanized and segregated churches. Segregated language. Segregated Faith.
There's no evidence that Eastern Rite Catholics have a "separate Faith." Or that Mexican Catholics have a "separate Faith" from Europeans or Africans or Americans.
You say segregated churches, yet the Catholic Church continues to grow, dramatically in many cases, with the segregated languages in use around the world.
Latin didn't exactly set the African Church on fire 40 years ago, did it?
What about Sts. Cyril and Methodius? Pope John VIII certainly thought that the Slavonic liturgy would help spread the Gospel.