Well I don't think most people should be doing that, I just believe the vast majority of people actually do want to do productive work, more than enough for society to function just fine if some people were shut-ins, I don't think it's a good thing to do and you're right it's bad for your health. We've had large societies long before the economic system we have now, and with technology, work that would take substantially longer in the past can be done more quickly with fewer people today.