its very cool seeing people learn different language and communicating with foreigners despite the language barrier, not everyone has the determination to learn another language, so it's really something great seeing people having the ethusiasm to improve their knowledge in other language
https://www.youtube.com/watch?v=wt-dbwNkx2slike take for example this other video, only those that understand the language can understand what is being said. so it would be greater understood from those that understand the language, though music wise, it can still be appreciated, language wise, much of the meaning, expression and words are not seen by those that dont understand the language.
https://www.youtube.com/watch?v=Pb0Xo6jbZRYthough its not shameful to skip learning other languages, its very hard and requires lots of dedication and depending on things, there is little use in knowing other languages if people dont have enough incentives to use extra languages, plus learning languages is easier at a younger age, and most are satisfied knowing one or two languages, usually their countries native language, and their family language if their family happens to have a different language background. every language has its advantages.
though overall, I think if people knew all languages, they would be able to understand each other's outward thoughts, and there wouldn't be barriers in communication overall and there would be greater respect and stuff.