Thanks for being open about your perspective on the interviewing process, and for taking the time to follow up on these threads.
Do you believe that technical phone pre-screens are ineffective in general? From what I've read Matasano doesn't pre-screen candidates, but provides complementary study materials instead. Is that because the subject matter is specialized? Would you approach hiring web dev roles differently?
From your remarks, it sounds like you would reject the practice of asking open-ended interview questions (e.g. describe your workflow, describe a typical day, describe a recent project) due to interference from the interviewer's bias. What, if any, value do you place on open-ended questions?