What fundamentals are those?

>Imagine a world where every car company would get money every time someone uses their car.

So oil companies? Moreover car companies do get more money with more car use. More driving means more parts required, more servicing needed (from their dealership network), and cars that need to be replaced sooner. It's not as instantaneous as uber charging your card every time you do a ride, but I don't see how that makes a material difference.

More demonstrating intent

I guess I should say that it isn't merely that we don't need an objective measure: we literally don't need a measure at all, as the crime would be attempting to cause it, whether or not it was even possible to do. Like, "our expert witness has strong evidence that X is not addictive, so my client could not ever be said to be engineering addiction" would not be a defense any more than "the plan my client came up with to kill their alleged victim could not possibly have worked, so my client can not be charged with attempted murder" is (at least generally) not a defense.