We have a lot of that in the United States. Based on results and not just.... We use 90 days. Agencies don't get paid unless the person has been on the job for 90 days.
Where we fall short is that when that 90 days comes up that person loses all the occasional supports. We found out that there are some people who are initially successful but then an incident happens and we need some support. We need to be able to have the continuing, episodic support too.
Pay them for results, certainly not for processes. I agree with you totally.