Well... the main difference is that backpressure in a mechanized system will always be respected, but a willful human can choose to ignore it. I can choose to l

Well... the main difference is that backpressure in a mechanized system will always be respected, but a willful human can choose to ignore it. I can choose to live in a small apartment and then proceed to make myself miserable by cramming it so full of junk that I can barely move around...