That was exactly my response when a psychologist friend of mine told me about the M-B tests. Then we did a test at work and the result was surprisingly accurate. I know you think it's a waste of time but maybe try it out anyway.
Also, as with many of these things: "the map is not the territory". Use any insight it gives, ignore what it doesn't.
Also, as with many of these things: "the map is not the territory". Use any insight it gives, ignore what it doesn't.