Learning languages other than English is necessary.

Learning other languages is necessary, because English is not the main language of the world at all. Chinese and Arabic are just two examples of other languages that are also widely spoken. If you like traveling or want to work abroad, you must speak other languages.
In my opinion, learning languages is also interesting. If you like traveling to other countries, where English is not the native language, or people do not speak English at all, you have to communicate somehow. For example, if you want to ask for directions, such as how to get to the grocery store or how to get to the station, people will not be able to understand you. In the upshot (I have not idea what "upshot" means.) you have to learn some basic words to make it work. If you have more experience with a language, you can hear interesting stories and facts about culture from people who may not speak English, but are really interesting. You can read books and sing songs in their original form. It is beautiful to hear things in their native languages; it is more real than translations.
On the other hand, learning English is much easier than learning Chinese. English is spoken in almost every major city. Children also have to learn English in school.
I think that learning other languages is important. I like exploring other countries, traveling, and also meeting new people from different countries. I would say that if you want to know a language other than English, it is your choice. Someone once said, "as many languages you know, as many times you are a human being"

I hope this is helpful! - Anne