A person with a severe impact might not have much external signs or pain, but could be bleeding internally. That would present a problem in the backseat of an uber on the highway.

Without stabilization, a broken bone can cut or puncture any number of blood vessels or organs (for a rib).

There's a reason we use medical transport after injuries -- you don't really know what might follow.

If the cost is the concern, using cheap transport isn't the answer. Either socialize the care or force workplaces to pay the EMT fees for workplace injuries. Sending someone in a cab is just not acceptable if a doctor deems medical transport necessary.

Now, all of this hinges on the particulars and accuracy of the description of the situation, which I can't really judge from the outside. But if otherwise independent medical professionals are being urged to reduce ambulance use in order to save face for the factory, that's a real problem. I'm inclined to believe the ousted clinicians and former employees, though.