Let me be clear, I don't think the tests are anything but a device to get people thinking and discussing our different ways of experiencing the world and recognizing that others have different motivating factors. I phrased the part you quoted poorly. The validity isnt the test, it's that we all have different "styles" as I mentioned before, these are not static. I don't think we would disagree on much regarding these except hat I find them to be much more benign than you do, perhaps because I've never known someone to really take them too seriously. That said, I think everyone wants to think they're a precious, unique flower when in reality, yes on a level you are but on another level you can be pretty damn predictable.
I really wish I had omitted any mention of MB. It was an afterthought in a post about the death of relationship and solution based selling.