As a side note I want to say that a seamless machine-human interface opens the downward arc of evolution where life serves matter. This will begin as a innocent attempt to "help" amazon warehouse workers become more efficient with an interface that lets them control a box pickup machine. Shortly after, after having seen the success of this innovation, the interface will be augmented with a feedback loop: workers will be able to see and hear thru the machines, to be even more efficient. After that, in order to boost efficiency and cut down on slack, the corporate will introduce a new feature - a mild electrical shock - to disincentivize unproductive behavior. After a few more such "improvements", the workers will live in a VR, bedridden, with their "reality" carefully mapped to their box pickup bots. Cogs in a machine won't be just a metaphor. There is no bottom in this descent: some even argue that your consciousness can move to such a machine, quite literally, and get trapped there.