I would think that the elimination of pain would require a great deal more consciousness on our part. Many of the “ouches” that you mention are the result of our unthinking activity. We are careless and stub our toe or burn our hand. The pain is a feedback that suggests that we be more careful walking in a cluttered room or taking a casserole out of the oven. As we pay more attention, the pain is less necessary.
The other issue of chronic pain is one that I am familiar with. It is hard to separate the pain from other functional issues. I would have to be able to completely eliminate it to find out whether the restrictions are caused by the pain or the cause of it. Still a more effective, non pharmaceutical method of reducing pain would be very welcome.