despite all the pseudoscience buzz really all a type does is offer a way to describe somebody and explain things.

if you describe somebody as "funny," can that change? it can, for a variety of reasons: they stop being funny. your sense of humor changes. their sense of humor changes. the definition of "funny" changes over time (which sounds odd but for purposes of comparison to socionics i think its a good reason).

maybe this is a bad example but i don't feel like explaining further atm.