So efficient we all don't need to work to sustain society?

The Kalahari bushman are, in regard to want verses need, the wealthiest and healthiest people on the planet. They spend about one day a week hunting and gathering and the rest of the week is leisure time.

Perhaps the question to ask is what is wanted. If you were to want a lifestyle like the Kalahari bushman you'd have to live like one but you can't do that in our society as that isn't how our society is built.