Quick Question: Subframe connectors- WHY didn't they do this from the factory?

It couldn't possibly have cost much money to extend the unibody reinforcement a couple feet. Is there a reason that they opted not to? It seems insane.

Is there anyone out there (other than those restoring a car to factory specs) who thinks that welding in subframe connectors is a bad idea?

Production Line = Speed and Cost

The 'Uni-Body' provided a smoother ride.