Talented developers are in short supply in the core tech industry. Outside that, the world is filled with "programmers" and "analysts" struggling to find jobs in enterprise IT and niche-market product development. Post a job to craigslist and you'll be drowned in resumes.

My suspicion (never having seen one of these tests) is that it's being used in these situations. I doubt Apple or Google are going to start using them any time soon. My guess is your advice is pretty bad for the people facing a personality test.