The boundary between machine and hand is fundamentally nebulous. Saying that we add human process feels like a backwards framing here. People do QA on things done by hand. People feed yarn into their own needles. The current process for knitwear manufacturing is basically the same as it was 200 years ago, but we have removed humans to the greatest extent possible. However with socks or yardage people are constantly operating on the machines. Someone needs to feed the yarn and patch it when it snaps. The boundary between hand and machine is just nebulous but every single step of the way has human hands.