"...to allow the priest to celebrate Mass in relative solitude with his back to the congregation, instead of facing and speaking directly to the faithful as Vatican II decreed."
What difference does it make which way the priest faces?
Why do people care so passionately and angrily about this sort of thing either way?
(2) We care because the center of attention of the Mass is not supposed to be an MC jawing at us, but priest and people jointly facing and focusing on the Blessed Sacrament.
The current configuration is in conflict with most of Church history. Before, the priest and the people faced the same direction, (in most cases, east, because from the perspective of Jerusalem, the Mount of Olives, were Jesus ascended into heaven, is east of the city. It is also the direction where the sun rises (Christ is the Light of the World)).
First off, "Vatican II" did NOT, EVER, ANYPLACE, "decree" that the priest face the people.
After you get History 101, we'll get into Aesthetics, Form, Symbol, and Meaning 101.
Because forms matter more than loving one's neighbor which is what real Christianity is about.
It's very pleasing to God to genuflect properly and have the mass said in the language of Jesus' killers and then can't even be nice to the people in the pew next to them, not to mention how they probably treat others in the world, on the net, in restaurants, in stores, and judge anyone who doesn't think exactly like them or the pope as being hellbound.
Because in the old days, the priest and the people faced together in the same direction towards God, whereas, now they are turned in towards each other (man centered) and celebrating themselves.
The fact remains, leaving aside all passions and arguments, that Vatican II never decreed that the priest should face the people at Mass.