As an outsider looking in, I am rather puzzled by all this.
As a Christian you are not an “outsider” really, but I agree this area carries more weight with Catholics, Orthodox, Anglicans, perhaps Lutherans, and perhaps some others, than with most Protestants.
Think of the Mass, not as a “worship service”, but as a ritual where something is
enacted. The closest analogy I can think of is a Protestant wedding; Bill and Jane were not married when they walked in the church, but when it is finished, they were. Something both supernatural and natural was enacted. On Earth and in Heaven, they are husband and wife. It is very different from a date, for instance, or a discussion about relationships.
The Mass is so rooted in Tradition that even that which is not essential to the Consecration is important. Those who prefer ad orientem, with few exceptions, accept the validity of Masses the other way, and those who prefer the priest facing the people accept the validity of Ad orientem Masses.
Personally ad orientem makes more sense to me as time goes on. In the 1960s Catholics were fully aware of the supernatural character of the Mass - a re presentation (not representation) of the sacrifice of Calvary - but were hazy on the character of a meal, a gathering of the faithful, a unity. The Church has throughout history made adjustments against the prevailing overemphasis. So “facing the people”.
But today, many Catholics lack an understanding of the Real Presence, the character of the priest himself at Mass, or the concept of “facing East”, looking in the “direction” of God throughout our lives. Maybe the time has come to make adjustments, to make clearer the traditional and Vatican II reaffirmed reality of the Mass as Sacrifice, as participation in the timeless liturgy of Heaven; so everybody including the priest face “Heaven”!
In the Middle Ages there was a legend that time stood still for you while you were attending Mass, so some people attended lots of Masses for that reason! Ok, Ok, we can smile at them, but there a grain of truth in that error, a grain we may have forgotten. We should all be aware of e ternity, out of time, the reality that what is enacted at every Mass has eternal consequences, above and beyond what we see and hear in this church. Mass is our joining in the eternal liturgy, or to put it another way, it is Heaven joining in “ours”. Ad orientem seems to suggest that reality a little clearer.