Benjamin Whorf and Edwin Sapir created the "linguistic relativity hypothesis" a long time ago. It argues that no language can express all thoughts available to the human mind but that, in fact, the language you speak limits the thoughts you can entertain. From this it would seem the more languages you know the wider your range of thought?Now, if we required enough Latin to grok et cetera, est id, etc., or German to get schadenfreude, uncertainty vs indeterminancy, etc, and Mandarin just because of China's industrial posture never mind geopolitics, we'd have to deal with a complementary issue of most humans never qualifying as competent adults. Plus, Hindi and Gujarti to make off color slurs at criminal scammer robocallers? What's that metaphor about a dog wearing boots as your mother and sister?
John Milton wrote in "Of Education" a suggest course of study for a well trained scholar. It included daily, a full ten hours of classroom instruction with the usual subjects of Latin, English, Greek, Hebrew, mathematics and all the rest. He laid out the hour by hour structure of the day and then added, as a bit of an after thought, that "one should, perhaps, study a little Italian and French" at the end of the day to round things out! I've been lucky enough to study a couple languages besides English and I can tell you, it's a lot of work and I take my hat off to anyone who has mastered a second language, let alone a third, fourth, and fifth. I have mastered to some degree, English and the other two are, well, passable, though probably barely.