Other than that it’s supposed to be traditional. By the way, when exactly did the Latin Mass come to be?
It’s really hard to say since it was a centuries-long process, but the EF Mass as we know it today was finally standardized beginning from the 1570 publication of the Roman Missal, and subsequent (not-so-major) revisions thereof until 1962.
Weren’t the original languages of the Church Greek and Hebrew? I thought, and correct me if I’m wrong, that Latin came many centuries later?
Well, it is generally thought that Latin began to be used, at least in Rome, by the 2nd-3rd centuries AD, gradually supplanting Greek, so it’s not as late as you might think.
Whatever happened to the original rites, why weren’t they preserved?
Because they eventually evolved, as all things in the world are wont to do (nope, not THAT evolution).
And if the Church adapted to the times and introduced a Latin Mass then, and had Jerome translate the Bible into the Vulgate (vulgar, common language), then why the aversion to using what the common language is at the moment?
Common mistake, that one. The
versio vulgata is named so in the Middle Ages (before that, it never had an official name) because it had become the ‘common version’ used throughout Western Christendom, not because it was written in Vulgar Latin; after all, by the time the term ‘Vulgate’ came to be definitively applied to St. Jerome’s translations, nobody was speaking Latin as a native language any more. In fact, the phrase
versio vulgata (which is a calque of Greek
koine ekdosis) was originally applied in St. Augustine’s and St. Jerome’s time to the version of the Scriptures used by Christians: the Septuagint.
I may not look like your ordinary traditionalist (I identify myself as one, however): admittedly I’ve never personally been to an EF Mass, and are open to a few what some people might consider slightly more ‘liberal’ (as opposed to ‘radical’) ideas, at least in the area of Biblical studies. Other than that I think I’m on the hard right, especially in liturgical and doctrinal matters. I’m a very inconsistent, contradictory person, so sorry about that.
Now why is a person like me drawn to the EF liturgy? Aside of course from the more exalted, reverential atmosphere its supporters claim it has (something I’ve yet to experience but would love to) - something that many of us have to reclaim in this de-spiritualized world - I strongly believe that the Pian liturgy, being a heritage of many of us Catholics in the Latin Rite (it was after all the result of centuries of faith!), should be given the proper respect that it deserves and not be treated as something ‘backward’ that we have outgrown, something that no longer has a place in our life as Catholics, or worse, something that we must get rid of. Such is after all NOT the Catholic way.
Besides, as was mentioned, quite a good number of the saints grew up with and were nourished spiritually by this liturgy: hey, if it worked for them…

This is also the reason why I love and have an interest in ALL liturgies, not just the Roman: those are the ways our fathers and their fathers worshiped. They are heirlooms that should be cherished and preserved for generations to come. That does not mean we should attempt to somehow ‘freeze’ them - since changes
are inevitable as time goes on - but we should at least keep things growing in an organic manner. Hey, the one who does not keep looking back at his place of origin can never arrive at his destination, as Filipinos would say.