Real-Talk Torah: What is So Tragic about the Torah’s Translation? (Asarah B'Teiveis)

One of the tragedies for which we mourn and fast on Asarah B'Teiveis is the translation of the Torah at the hands of Ptolemy which took place on the 8th of Teiveis (today's date). But, what exactly is so tragic about the translation of the Torah? Translations grant us access to Talmud Torah! Did anyone fast when the Schottenstein Gemara was printed? Is Artscroll doing the wrong thing? Let's talk about it.