Medicine is a team activity. There is no amount of money which could ever make it feasible to have multiple physicians working simultaneously on routine cases, but they do delegate some tasks to lower licensed providers such as nurses and technicians.

For really complex cases there is the Mayo Clinic model (also used in a few other health systems). A patient can come for a day and be seen by an integrated team of specialists to get a diagnosis and treatment plan. But this isn't really scalable.

https://www.mayoclinic.org/patient-centered-care/what-makes-...