[NYer]

What’s the big deal about Latin? Peter spoke Aramaic, right?

Yes, Peter did speak Aramaic but "when in Rome ..... ". Latin became the liturgical language of the Latin (Roman) Catholic Church.

Before he went to Rome, though, Peter served as Bishop of Antioch. To this day, the Consecration is still chanted in Aramaic in the Antiochene Catholic Churches - the Maronite, Chaldean and Syro-Malankara Catholic Churches. To hear those words chanted in Aramaic is like being at the Last Supper.

[ctdonath2]

but "when in Rome ..... "

Exactly. This is the USA. We speak English here, not Latin.

Peter served as Bishop of Antioch. To this day, the Consecration is still chanted in Aramaic

Why not the mass in general then?