Well, really, how different is it from the Chinese Ground/Fire/Water/Wind personality traits system? You can explain anything with it: Roger is Water with some wind, and B-Con is mostly Fire with some ground mixed in. We need more "ground" people for our team!

What does that tell you that "hey, this team is pretty pie in the sky and chasing ideas that aren't likely to be monitized. Let's get a product manager in here to give some direction!" The latter, I argue is far superior cognitive model, and has the decided advantage of being based on empirical observations. (I know you weren't arguing for MBTI, I just used your post as a launching off point since you mentioned the existence of different systems).