I still ask to design Twitter, but make it clear that it's about the process, and follow ups are driven by where the candidate leads to. The material from OP w

I still ask to design Twitter, but make it clear that it's about the process, and follow ups are driven by where the candidate leads to. The material from OP won't prepare you for systems design interview (witch is also your point?). Only experience will, so we measure experience and leadership. Juniors can apply to systems design openings and will be interviewed, but they end up as generic SWEs if hired. If one thinks one can work on distributed systems coming out of university you will have a hard time interviewing or not like it.