As someone fluent in four languages*, I agree. I would even argue that the opposite of an advantage is true. Consider this: it adds unnecessary cognitive load. When trying to think of a word, it comes to you in four different languages, which isn't helpful! I speak four languages out of necessity, not by choice. When you can focus on fewer languages, your proficiency in them improves. Although I can speak four langua…
I also speak the same four languages plus one more. I do consider there are advantages to speaking several languages. I learned from English that you can be very precise, but also economical in exposition of complex matter. I learned from Russian how incredibly powerful and nuanced a language can be (too bad it is currently used to scare people everywhere). I always say that "you can translate anything into Russian"…
Not all types of Arabic https://en.wikipedia.org/wiki/Varieties_of_Arabic, some are different enough to be considered a different language as different as Nigerian Pidgin and British English.
> I learned from Russian how incredibly powerful and nuanced a language can be (too bad it is currently used to scare people everywhere).
I don't find Russian to be particularly more expressive than any other bigger slavic language, like Polish or Yugoslavian. I would say that it's largely a myth propagated by Russians. It has a bunch of newer loan words from French, German and kept some of its' older synonyms, oh and a lot of archaics from Old Church Slavinic. In that sense it isn't more nuanced than English. One more con is that the convoluted sentence structure makes it an unfriendly language for non native speakers to learn. Phonetics are terrible, a bunch of my friends that had been studying Russian fairly well and still don't know how to pronounce those rarely used words.
How is Russian language used to scare people? If you live in EU and hear a lot of Russian you shouldn't be scared since a lot of them are Ukranian refugees from the East and South. There are very few Russians you should be scared of, except some angry and very drunk ones in tourist resorts, fortunately those aren't coming in droves anymore.
I speak a few different languages, knowledge of languages is overrated if you don't use them regularly. Actually I regret learning some of those, that time would have been better spent on acquiring some technical skills. I have met very few people that are truly bilingual, most of them say they are, but aren't actually equally as good in both. A lot of Ukranians are bilingual btw, but it's easier when two languages are that similar.