"Why did things change after Vatican II?"
Vatican II gave modernist heretics the opening they needed to damage the Church in many ways. When the priest was the only one who received the Blood of Christ, this was one more thing that set the priesthood apart...one more thing that made priests special.
Abolishing those sorts of things should logically translate into fewer vocations...and voila! It has.
This thread is not about vocations, so I am wondering why you put that comment in?
"Damage" the Church -- is this your opinion?