The whole thing is a minefield. Although it'll probably take off, as xkcd predicts.
I like the book form-factor but that's mainly just because I like books.
Vague questions are always red flags in an interview -- there are too many possible ways of answering to be able to determine which is the "right" answer, and applicants will tend to start looking for where the trick is, since it sounds like a trick question.
Not the right applicants. For most positions (except the ones where you're a very small cog in a very large wheel) you have to be able to deal with people too.There was one question in a recent interview that my wife conducted, to which the applicant replied "I can't answer that without knowing more about the requirements." Which was exactly the right answer. He got the job.
I don't really have anything to fix that, other than the observation that corporate culture starts from the top. If a company is built and run by an engineer then they'll respect people who actually get the job done. If it's run by people who got there by schmoozing then they'll only respect people who schmooze.
Without having the skills to be precise
Or the skills to recognize whether something is precise
Or the skills to recognize whether someone is being precise
And yet still somehow assuming that it's easy to be precise.