I do not think that is necessary. When I was in nursing school, we had to perform all skills with our patients, including the bed changes, baths, vital signs, etc. We were not allowed to let the CNA help us. I think this gave us a good enough idea of how much work their job can be. Especially when I considered how long it took me to give one bed bath, and how long it could take them to give several more. I don't know if all nursing schools do that though. If not, then they should.