Yes this is because you spent time around it and used it frequently. Funny thing is if you did the same thing with Latin you would be able to understand it as well. Sure you may have to put effort into learning something but is that really a bad thing?
Learning is not a bad thing. However, before Vatican 2, Latin was taught primarily as a translated language, rather than as a spoken language. And predominately the translation was in one direction - Latin to English. There was a new method being introduced in the very early 1960’s to teach Latin as a spoken language; but Latin was already fading from popularity (and that is not confined to Catholics - it was taught in a lot of public schools as well). Out of all Latin students, there were precious few who could speak it; even among my class in college seminary (two years of college Latin).
So to begin with, unless one has access to a course of Latin being taught as a spoken language, your point is theoretically possible, and practically not.
Why? Did Romans not exist back then? Was the sign above Christ’s Cross which said “King of the Jews” written in Aramaic or was it Hebrew, Greek, and Latin? Fun trivia. Which three languages are in the Tridentine Mass? One clue. They were all on the Cross. Maybe this is why they are used in the Liturgy?
Latin may have been used in some areas; in others, Aramaic; in others, Arabic or Slavonic. Latin was gradually adopted over several centuries as the official language of the Western Church, as it was a language that had been iontroduced to a number of countries as the Romans went out and conquered them and became the ruling status quo. Had Germany won the war and in the process, invaded the US and conquered us, most people living under German rulers would know German, and not just those who took it in high school or college.
Who’s vernacular you don’t know.
No, but it is still used in the Maronite rite, along with Arabic.
What I still find hilarious is those who have learned to parrot parts of the EF and tell me they know Latin; I simply disprove it by digging back into my ancient history, revising a word or two and asking them what it now says. Not a clue in the least. They may know that this phrase in Latin means that phrase in English; that is not knowing Latin.
If people want to attend a Mass in Latin, that is perfectly fine; they do not need to know how to speak Latin. But they will need to use a missal with the translation, or they are not going to be able to tell what the pries just said.