At a certain level of experience, you do have an idea of what kinds of things can be nuances and pitfalls, though. And for certain team/codebase sizes, the effo

At a certain level of experience, you do have an idea of what kinds of things can be nuances and pitfalls, though. And for certain team/codebase sizes, the effort required to learn and adapt to the specifics of the in-house systems will almost certainly dwarf the pitfalls of the general parts of the language/platform/stack. 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).