I can get cooking with a programming language I’ve never seen in my life in a matter of days because most programming languages are either very similar to each other or they’re similar to some paradigm most of us already know like functional programming. The companies looking for 5 or 10 years of experience with a language aren't looking for someone to "get cooking" and learn as they go. It's true that most experienc…
There's some shortcomings of the algo-oriented interviewing practices FAANGs are famous for, but IMO one of the things they get very right is that language/stack knowledge is considered less interesting compared to general problem solving skills (and I say that as someone who failed to get an offer on his last round of trying).