I still have not voted on this one as it has been running around in my head now for a couple of days. As someone who races an older car and a car that does not easily make weight the idea of throwing away some parts like headlight motors sounds good but the reason we have to keep them is not because the rule book say so it is because of a basic principal of IT. If it does not say you can then you cannot.
If your thought is to have a rule that says you can remove parts that are not required in order to build and race your car then this puts that principal in jeopardy.
This leaves you with the only option of itemizing what part are superfluous and I agree that we will not agree where to draw the line.