> but so much of grabbing part A and inserting it into part B and adding screws is done by people. the reason is that this work is "simple" for a human to do,

> but so much of grabbing part A and inserting it into part B and adding screws is done by people. the reason is that this work is "simple" for a human to do, but very complicated to make a machine do it (reliably and with low maintenance).