For some I'm sure they are a waste of time. For others, learning foreign languages is useful.
My oldest was always interested in Russian culture and took four years of Russian language courses in college. I'm sure that served her well during the three years she spent there.
She has also taken several years of Spanish language classes and tells me it is very helpful to know living in Santiago. She says she is still getting used to the Chilean Spanish dialect spoken there. It is apparently a bit different than other Spanish dialects.
I wasn't entirely serious

I've yet to meet a foreigner, a non-first-generation expat (or even someone who left Russia/USSR as a child), whose picture of the Russian culture wouldn't be
completely detached from reality, unless reality is limited to a bunch of Instagram-grade tourist traps in
Mordor Moscow. I know they exist, like that Jolly Farmer guy in the Altai mountains who came here as a child with his ultrareligious parents, but I haven't met any in person. How foreigners who studied Russian culture outside Russia imagine it is usually anywhere between mildly embarrassing to complete sugary stereotype-laced lunacy. Russian culture is NOT a global language despite the wishful thinking of some groups, and is very poorly represented outside the former USSR, so immersion/studying locally is the only way to learn/experience it. Learning English and Spanish as a foreign language is different simply because they have much more cultural weight, globallly. So while I have nothing against such interest, I firmly believe that nowadays, especially with the advance of machine translation/AI, spending precious college time on a rare foreign language, when one's brain is still young and highly functional, or worse, specializing in it, is a risky/unwise decision for a young person, unless they're getting the education for fun, or are certain that thay will have someone to sponsor their lifestyle afterwards (most of my alumni became mail order brides or housewives by the way, and some ended up working in completely unrelated fields, such as medicine). It's also my opinion, as someone qualified to teach languages (a BS degree, neverheless) that Duolingo combined with Youtube currently by far outperforms most college courses if the person is motivated

and it's free.