Just to clarify: I used "take-home" by analogy to taking a test in class (= whiteboard) vs. having a week to work on it in as you wished in your dorm room (= puzzle on our website).

We did not actually give people tests to take home. :)

Interviewing is a numbers game. Your goal is to come up with a process that balances time spent by the interviewer with finding a suitable candidate.

You have to admit that this is biased towards a company, like Google, that must hire many more people per unit time than most companies do. (And the Google process seems to work remarkably well for Google.)