As a healthcare institution, you want to provide the best care possible for your patients. With that, finding the right people for the job is crucial. You want professionals who know exactly what they are doing. You cannot micromanage your entire staff, which is why you need people that you can depend on.
In addition to that, you need to make sure that your personnel is complete. You need enough people to keep your institution moving. However, you cannot control when someone suddenly has to take a leave.
On the part of a healthcare worker, you want to be able to choose your hours. You love helping people feel better again, but you also want to have the time for the things that bring you joy. As a contracted worker, you cannot choose what you want.