The doctors get rich for performing nothing of worth. We aren't perfect and never have been, probably never will be. But history also tells us that we can be tested, storms, disruptions, will occur, and complacency about being far less perfect than we might be can have devastating consequences. Individuals and groups can fail to survive by very small amounts. You do not see limping deer.
Nature weeds out the imperfect.
We should never be completely complacent about how good we are. It is true we do not know whether that will be good enough. But we can be satisfied that we have done our best. If you want to walk into the future, knowing that you could do a lot better but not worried about it, then I feel sorry for you. On the other hand, many people have strange ideas about perfection, and waste energy polishing things that have no real function.