I think it can be ok when you're doing something boring or don't have anything to do and can't do anything else, but I don't advise it at other times unless there's a goal, like if it's for introspective insight or you're brainstorming. Time is the only resource you can't get back.
This reminds me of "mirror people" in VR chat.
True but the more money that gets spent, the more people need to be taxed.
In certain situations it could be beneficial for some people but I don't think it should be applied to everyone. If you have an autistic person who went to college but is working low income jobs because they struggle with finding jobs and doing job interviews, then they could be good candidates for such a program. Of course I think it would be better to have a program that helps teach people in that position how to look for jobs and do job interviews.