"Some type of personalities might just be too stressful when being asked to do this kind of job constantly." - Couldn't agree more, I've witnessed people suffering to the point of becoming depressed; I can assure you it's not a pretty sight.
Regarding learning new languages, you're absolutely right. To progress and further yourself you need to improve and learn. I've never worked at a place that required you to know one language, but then I think this debate comes into play: "Quality over Quantity?"
Thanks for sharing!
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