“Learning any language in which a Torah essay has been written is certainly of inherent value!”
Learning a language to be able to understand Torah written in that language is definitely a good idea. All I was saying is that one can’t prove from the fact that the Sanhedrin had to know many languages that we should know many languages.
Also, if the only reason one is learning a language is to learn Torah written in that language, he only needs to learn how to understand the language, not how to express himself in it.