Aveline
There must be many aspects of work in care homes that could be done by anyone without special training. Eg taking round refreshments, tidying, chatting to those without visitors, generally being a pair of hands. This could free up more experienced staff for the more complex and/or intimate jobs.
As an untrained NHS ward volunteer I can find lots of jobs to do that are easily manageable, contribute to patient care and give staff more time for sharp end stuff. It's a two way thing of course. I enjoy it very much and meet some lovely people. There are positive sides to care work.
What you're saying is that anyone could do this work (not just teachers or nursery school staff). From what I've read, the idea is to get these people quickly. Even being a "pair of hands" needs somebody to supervise and give instructions, which takes time away from providing care.
Even taking round refreshments needs somebody to explain where to place the food/drinks, so that it's accessible, instructions on what to do if a person leaves food and drink untouched, not giving sugary foods to diabetics or certain drinks to those who could choke, etc etc.