I remember failing an interview once because they wanted me to know all sorts of obscure c++ tricks. The kind of stuff that most people skipped over when they read about it because it has almost no use case. Had travelled 200 miles for that interview too.
No idea who they wanted.. someone who had a photographic memory to memorise a textbook, maybe?
We tend to give practical tests when interviewing.. 'go away and write this thing'. We're not testing whether they write it, or how they found the solution.. google is there to be used.. but the questions they ask about the (deliberately) interpertable spec and what the code looks like.
You're not really tied these days because PD exists (and where that's not possibly they'll install dialysis machines in homes), but yeah a quality of life improvement to just have a portable thing.