Isn't it exactly the opposite?
Language barriers: LLMs are language models and all of the major ones are built in English, speaking that language fluently is surely a prerequisite to interacting with them efficiently?
Knowledge: famously LLMs "know" nothing and are making things up all of the time and sometimes approximate "knowledge"
Google Translate is relatively awful. I have an intern now who barely speaks my native language but very bad English so weve been using it all the time, and its always spot on, even for phrases that dont translate directly
I bet I can do a good job communicating with you without speaking a common language.
It was absolutely flawless, to the level of accentuations and little quirks that no tool before even came close.
Parent is plain wrong and doesnt have a clue... thats what happens when folks skip on learn foreign languages, the most important thing for life you can learn at school. Actively using multiple languages literally increases brain plasticity, much better than running ie sudoku or similar brain teasers endlessly
Knowledge: True to an extent, but my assumption here is that it would be used to fill in gaps or correct misunderstandings. Not wholesale doing my job. At least that’s often how I use it
That said, I have one ESL on my team who uses LLMs a lot like that and it's fine so who knows.