"There are two kinds of people. Those who divide people into two kinds, and those who don't."
So, when someone produces a categorization like HedgehogAndFox, the question is not whether it is absolute truth. It isn't. ItDepends. The question is whether or not one can make it useful. This is a valuable mental model. You can use it to understand other people. You can figure out why there are arguments. It can give you some clues about how you can be more effective. In understanding your and others' strengths and weaknesses you can become more successful.
All models are false, but some are useful.
-- RalphJohnson
See also: ThereAreNoTypes MappersVsPackers ModelMaker StampCollector