Attempting to pigeonhole people has a major issue.
The issue is that an adherent of any of the dozens of pigeonholing systems can rarely see outside the framework of that system.
Combine that with the fact that people are quite a bit more complex than any of these systems allow for leads to huge errors in judgement on the part of the pigeonholer.
Me, I find it a hell of a lot easier to treat people as individuals, instead of futilely trying to fit them into nice, tidy little boxes.