> That being said, McK did create an entire game that they claim can't be studied for ahead of time. If the intention is to test true problem solving skills, then maybe that's roughly equivalent to a systems interview, which is hard(er) to cheat .

Sure, right up until someone leaks it

Maybe, but they have hundreds! And new ones every quarter! Having done both systems and case interviews I can say that leaking is not as big a problem as with coding interviews. Sure you can memorize how to build Netflix/Zoom, or how to analyze P&L for a sandwich shop, but those interviews depend on interviewers throwing in complications or asking clarifying questions.