Actually, there is something to be said for the "scoop and run" method of getting an injured person to a hospital. It's a conclusion that surprised me, but I've come across it in several sources.
https://www.sciencedirect.com/science/article/pii/S002013830...
This research is still within the context of trained medical personnel bringing the injured person to the hospital. If an untrained person attempts to handle someone with a broken neck, for example, there is a high risk of causing paralysis or even death.
That doesn't make much sense. The primary advantage of emergency vehicles is to transport medics to the site of the emergency so that they can administer first aid and stabilize the person for safe transport to the hospital.
Having just any person off the street pick up a critically injured person is not going to go well. In all likelihood, they'll further injure the person due to their lack of training.