I am not sure if I understand your point - but if what you say is that you can never tell if the complexity measured by some measure is below the practical lower bound of complexity - and so any measure is impractical? Then I don't agree - you can argument if a module does all we want it to do (and thus that it is above the minimal practical complexity) separately from measuring it's complexity. And the difficulties with the first don't make the second just 'gut feeling'.