You lose the knowledge your workers acquired on the job; a new hire cannot offer you that.
So this only works if you are in a franchise business where everyone works to a script and does not innovate, develop long-term relationships, or perform an important leadership function.
Wrong! As a business, you should overwork you employees. When the dementia starts affecting performance you fire them. This way you can privatize the benefits (long hours) and socialize the losses (some else takes care of them). Anything else would not be good for profits.